Divorce

is_shown = trigger_if = {
	limit = {
		scope:puppet_or_actor ?= {
			pam_grants_own_divorce_trigger = no
		}
	}
	NAND = {
		scope:puppet_or_actor.rite ?= {
			rite_has_doctrine = doctrine_divorce_approval
		}
		scope:puppet_or_actor.faith ?= {
			has_doctrine = doctrine_spiritual_head
			exists = religious_head
		}
	}
}
NAND = {
	scope:puppet_or_actor.rite ?= {
		rite_has_doctrine = doctrine_divorce_approval
	}
	exists = scope:puppet_or_actor.house
	exists = scope:puppet_or_actor.house.house_head
	scope:puppet_or_actor = {
		is_house_head = no
	}
}
exists = scope:puppet_or_actor
scope:recipient = {
	is_spouse_of = scope:puppet_or_actor
	is_concubine = no
}

As written in game/common/character_interactions/00_marriage_interactions.txt.

trigger_if = {
	limit = {
		scope:actor = scope:puppet_or_actor
	}
	custom_tooltip = {
		NOT = {
			scope:puppet_or_actor.culture = {
				has_cultural_parameter = cannot_divorce
			}
		}
		text = CULTURE_FORBIDS_DIVORCE
	}
}
trigger_else = {
	custom_tooltip = {
		NOT = {
			scope:puppet_or_actor.culture = {
				has_cultural_parameter = cannot_divorce
			}
		}
		text = CULTURE_FORBIDS_DIVORCE_puppeteer
	}
}
OR = {
	NOT = {
		scope:puppet_or_actor.rite = {
			rite_has_doctrine = doctrine_divorce_disallowed
		}
	}
	AND = {
		scope:puppet_or_actor.rite = {
			rite_has_parameter = tenet_be_fruitful_and_multiply_low_fertility_divorce
		}
		scope:recipient = {
			fertility < 0.1
		}
	}
}
scope:recipient = {
	NOT = {
		has_strong_hook = scope:puppet_or_actor
	}
}
scope:puppet_or_actor = {
	trigger_if = {
		limit = {
			scope:actor = scope:puppet_or_actor
		}
		custom_tooltip = {
			NOT = {
				var:family_widow_forbidden_divorce ?= scope:recipient
			}
			text = BOUND_TO_FAMILY_WIDOW
		}
	}
	trigger_else = {
		custom_tooltip = {
			NOT = {
				var:family_widow_forbidden_divorce ?= scope:recipient
			}
			text = BOUND_TO_FAMILY_WIDOW_puppeteer
		}
	}
}
trigger_if = {
	limit = {
		scope:is_puppet_action ?= yes
	}
	scope:puppet_or_actor = {
		piety >= divorce_cost
	}
}

As written in game/common/character_interactions/00_marriage_interactions.txt.

on_accept = if = {
	limit = {
		scope:is_puppet_action ?= yes
	}
	scope:puppet_or_actor = {
		add_piety = {
			value = {
				add = divorce_cost
				max = piety
				multiply = -1
			}
		}
	}
}
scope:puppet_or_actor = {
	divorce_effect = {
		DIVORCER = scope:puppet_or_actor
		DIVORCEE = scope:recipient
	}
	if = {
		limit = {
			allowed_concubines = yes
		}
		if = {
			limit = {
				scope:actor = scope:puppet_or_actor
			}
			custom_tooltip = divorce_cannot_concubine_ex_wife
		}
		else = {
			custom_tooltip = divorce_cannot_concubine_ex_wife_puppeteer
		}
	}
}
scope:recipient = {
	trigger_event = marriage_interaction.0030
}
add_clan_unity_interaction_effect = {
	CHARACTER = scope:puppet_or_actor
	TARGET = scope:recipient
	VALUE = major_unity_loss
	DESC = clan_unity_divorce.desc
	REVERSE_NON_HOUSE_TARGET = no
}

As written in game/common/character_interactions/00_marriage_interactions.txt.