I think sometimes, when we’re frustrated with people who have treated us in a negative manner so many times, might refer to our husband, mother-in-law, sibling, cousin, relative, friend as “crazy” or “evil” or “psycho”, etc etc.
I don’t think that the poster is trying to say that divorce makes a person a psychopath. Just because someone is divorced does not mean that they’re unstable.
The poster has said that there are two sides to the story. She’s not saying that the divorce makes her cousin a psychopath. I think she means that her cousin’s frequently harmful and offensive behaviors (possibly even prior to marriage) make it hard for others to trust her.
Anyhow, we don’t know all the details as Beeni has mentioned above. InshaAllah, all the parties involved in this story (the cousin, her ex) will find peace in their lives.