divorce_effect

divorce_effect = {
	$DIVORCER$ = {
		if = {
			limit = {
				any_spouse = {
					this = $DIVORCEE$
				}
			}
			divorce = $DIVORCEE$
		}
		
		if = {
			limit = {
				NOT = { amicable_infertile_divorce_trigger = { DIVORCEE = $DIVORCEE$ } }
			}
			reverse_add_opinion = {
				modifier = divorced_me_opinion
				target = $DIVORCEE$
			}
		}
	}
	# Opinion hit
	if = {
		limit = {
			$DIVORCER$ = {
				NOT = { amicable_infertile_divorce_trigger = { DIVORCEE = $DIVORCEE$ } }
			}
		}
		$DIVORCEE$ = {
			every_close_or_extended_family_member = {
				limit = { NOT = { this = $DIVORCER$ } } # don't hate yourself just because of some incest
				custom = all_family_members
				add_opinion = {
					modifier = divorced_close_kin
					target = $DIVORCER$
				}
			}
		}
	}

	hidden_effect = {
		if = {
			limit = {
				$DIVORCER$ = {
					any_relation = { type = wedding_very_bad_fertility this = $DIVORCEE$ }
				}
			}
			$DIVORCER$ = { remove_relation_wedding_very_bad_fertility = $DIVORCEE$ }
		}
	}
	
	if = {
		limit = { $DIVORCER$ = { has_relation_lover = $DIVORCEE$ } }
		lover_breakup_effect = {
			BREAKER = $DIVORCER$
			LOVER = $DIVORCEE$
		}			
	}
}

As written in game/common/scripted_effects/00_marriage_interaction_effects.txt.