It may be when you have a dead end conversation with a friend and you feel like it is being forced. They may appear uninterested in good things happening in your life and you feel like it is sucking your positive energy out by being around them. Or you may simply feel like spending time with them is an obligation. Have you ever left a person and felt mentally drained? They may not have even done anything wrong. Their role in your life is just not fitting in with the storyline any longer.