Arizona is a no fault divorce state, meaning that marital misconduct like infidelity won’t have any impact on the divorce. There are a few exceptions, like if the spouses have signed a prenuptial or postnuptial agreement, or one spouse committed marital waste. If one spouse recklessly wastes money on an extramarital affair, drugs, gambling, etc., the other spouse can be credited for that amount during property division. You will need to prove your spouse was unfaithful if you are in a covenant marriage, a special type of marriage in which divorce can only be granted in limited circumstances. Less than 1% of marriages in Arizona are covenant marriages.