Agreeing to be friends
When someone is leaving you, they might offer to stay friends with you. They do this because they feel guilty or because they want to keep someone who loves them close. Agreeing to be friends right after breaking up means that the story is not over yet.
Why it’s harmful: If you decided to break up, then a friendly relationship will leave room for hope. You may keep waiting for the relationship to start again, but it most likely won’t.