The process of separation contains a lot of threats, whether real or imagined. Many of these threats are obvious: the risk of losing an asset, the risk of not being able to have another romantic relationship, the risk of losing one's children. Fear triggers the fight-or-flight response; anger can be a manifestation of the fight response.

Anger can stop you from recognizing positive steps your former partner is taking to resolve issues, and lead you to assume that your partner is acting on false pretenses or on a hidden agenda. This kind of anger breeds suspicion that is often unwarranted.