Almost half of all civil divorces granted in Singapore last year proceeded on the grounds of unreasonable behaviour, accounting for 48.7 per cent of marital breakdowns among non-Muslim couples. In sharp contrast, adultery featured in just 0.9 per cent of civil divorce cases during 2025, according to statistics released by the Department of Statistics on July 10. The figures paint a strikingly different picture from Muslim divorces, where infidelity emerges as a far more prominent cited reason. Among couples divorcing under Muslim law, approximately 18.4 per cent identified infidelity as the principal issue, ranking as the second most frequently cited ground after personality differences at 21.5 per cent. Legal practitioners emphasise, however, that these variations reflect fundamental differences in how the two legal systems operate rather than suggesting substantially higher rates of actual infidelity among Muslim couples.
The divergence between civil and Muslim divorce statistics stems from contrasting legal architectures governing each system. Civil divorces in Singapore operate under the Women's Charter, which recognises a single overarching legal principle: that a marriage has broken down irretrievably. To establish this breakdown, parties may invoke one of six distinct facts. Three of these carry fault-based elements—adultery, desertion, and unreasonable behaviour—while two are non-fault based, permitting divorce after separation periods of three years with mutual consent or four years without. A sixth pathway, divorce by mutual agreement, entered the legal framework on July 1, 2024, and quickly became the third most commonly invoked ground. Muslim divorces, by contrast, fall under the Administration of Muslim Law Act and are adjudicated in Syariah Courts according to AMLA provisions and applicable Muslim law principles. Importantly, AMLA does not prescribe specific statutory grounds as the Women's Charter does, allowing Syariah Courts discretion in determining divorce proceedings based on the circumstances and Islamic legal principles.
The practical difficulty of proving adultery in civil courts substantially influences why couples overwhelmingly favour alternative grounds. Establishing adultery through the lens of civil law requires substantial, often expensive evidentiary support. Parties typically must present compelling circumstantial evidence—private investigator reports, photographs, or video documentation—demonstrating that their spouse engaged in a sexual relationship with a third party. This burden creates several disincentives. The discovery process becomes protracted and costly, potentially escalating legal fees and court proceedings. Beyond financial considerations, pursuing adultery as a ground transforms divorce proceedings into adversarial contests laden with emotional friction. By contrast, unreasonable behaviour provides a considerably more flexible framework. Spouses who suspect infidelity frequently cite unreasonable behaviour instead, avoiding the necessity to prove extramarital sexual conduct and sidestepping the inherent acrimony such proof entails.
Unreasonable behaviour encompasses a deliberately expansive spectrum of conduct that destabilises marriages. Legal practitioners confirm this category extends far beyond simple disagreement or incompatibility. It encompasses family violence, ranging from physical assault to psychological abuse; verbal aggression and demeaning conduct; controlling or manipulative behaviour that undermines partner autonomy; substance addictions affecting family wellbeing; compulsive gambling draining household resources; financial mismanagement; systematic neglect of family obligations; and indeed extramarital affairs. This breadth renders unreasonable behaviour the practical default for many divorcing couples seeking to characterise legitimate marital breakdown. When divorces proceed uncontested, parties need not furnish exhaustive documentary evidence, as neither side disputes the characterisation. In contested matters, supporting documentation may include personal communications, bank statements, police reports documenting domestic incidents, medical records evidencing injuries or psychological harm, and testimony from witnesses positioned to observe the conduct—neighbours, relatives, or family counsellors.
The strategic advantages of unreasonable behaviour further explain its dominance in civil divorce statistics. Compared with adultery grounds, unreasonable behaviour requires substantially less rigorous proof, eliminating the investigative burden and associated expenses. Critically, this ground permits couples to initiate divorce proceedings immediately, without mandatory waiting periods. The separation-based grounds impose temporal constraints that many find unacceptable. Couples invoking separation of three years with mutual consent must wait three years before filing; those without consent must separate for four years. Conversely, unreasonable behaviour permits immediate action, allowing aggrieved parties to dissolve marriages without prolonged limbo. For couples experiencing deteriorating relationships, this immediacy proves decisive. Where one spouse wishes to exit the marriage but the other resists, unreasonable behaviour offers a pathway to dissolution without the protracted delays separation grounds would impose.
The distinction between how civil and Muslim divorce statistics are compiled amplifies the apparent disparity regarding adultery. In Muslim divorce proceedings, Syariah Courts record the stated reason couples identify for marital breakdown, capturing how divorcing parties themselves characterise their situation. This approach reflects the Islamic legal tradition prioritising the parties' articulated grievances. Civil law operates differently. Adultery as a legal ground requires formal proof meeting evidentiary standards before courts. The statistical record thus captures only those cases where adultery was not merely claimed but substantiated through evidence and accepted as proven. This methodological difference alone explains much of the apparent contradiction—Muslim divorce statistics reflect parties' stated reasons, while civil statistics document legally proven grounds. When infidelity caused marriage breakdown among civil divorcing couples but parties elected not to prove it formally, that infidelity disappears from statistical records, recorded instead under the unreasonable behaviour category they cited instead.
The introduction of divorce by mutual agreement on July 1, 2024, represents a significant shift toward reducing acrimony and blame in Singapore's marital dissolution framework. This pathway fundamentally reframes divorce from a fault-based contest into a collaborative agreement to end the marriage. By permitting couples to divorce without attributing blame to either party, this mechanism eliminates what practitioners describe as the blame game inherent in traditional fault-based grounds. Couples no longer require one party to demonstrate the other's culpability; they simply acknowledge mutual agreement that the marriage should terminate. This development particularly benefits couples navigating infidelity but seeking amicable separation. Rather than litigating adultery with its attendant evidence gathering and public airing of sexual indiscretions, couples can divorce by mutual agreement if they reach consensus, protecting privacy and reducing emotional damage. In 2025, divorce by mutual agreement already ranked as the third most frequently cited ground, suggesting couples recognise its value in streamlining proceedings and reducing conflict.
For Malaysian readers, these Singapore patterns warrant attention as both jurisdictions share Common Law heritage and increasingly parallel legal reform trajectories. Singapore's embrace of no-fault divorce through mutual agreement reflects broader Commonwealth legal evolution toward reducing acrimonious dissolution processes. Malaysia's own family law landscape, fragmented between civil courts and Syariah courts with their distinct frameworks, mirrors Singapore's bifurcated system. The practical lessons from Singapore's experience—that fault-based grounds often devolve into costly, acrimonious contests; that couples frequently prefer alternatives even where fault exists; and that no-fault mechanisms facilitate speedier, less emotionally damaging dissolutions—carry direct relevance for Malaysian policymakers and practitioners. As Malaysia periodically reviews its family law framework, Singapore's experience with divorce by mutual agreement and its relatively rapid adoption provides instructive precedent.
The broader implication from Singapore's statistics concerns how legal frameworks shape behaviour and litigation strategy rather than necessarily reflecting underlying conduct patterns. Jurisdictions permitting easier proof of infidelity might generate higher statistical frequencies of adultery citations without indicating genuinely higher infidelity rates. Conversely, systems imposing substantial proof burdens naturally deflect parties toward alternative characterisations. This dynamic underscores how law functions not as a neutral recorder of social reality but as an active shaper of how disputes are framed, presented, and resolved. Couples facing marital breakdown necessarily operate within their jurisdiction's legal options, selecting grounds that minimise cost, expedite resolution, and reduce emotional damage. These rational choices produce the documented statistics—not primarily differences in infidelity prevalence. Understanding this distinction matters enormously for policymakers, judges, and legal reformers interpreting divorce statistics and crafting family law responses to contemporary marriage dissolution.
