Alimony is meant to be based on economic and not personal or emotional factors. If your spouse has begun cohabitating with a new romantic partner, it may serve as a basis for the court to find sufficient changed circumstances to warrant modification or termination of alimony, especially if cohabitation is expressly stated as a grounds for modification or termination in your postnuptial or marital settlement agreement or in the court’s alimony award. However, if your ex has moved in with a new partner, it does not automatically mean you are entitled to modification or termination of your alimony obligation.