You get so used to having emotional pain to deal with that it becomes your default setting, you're used to it and what is the best way to approach it. When that pain is gone, you're in new situation, you don't have something to focus on getting better. Not knowing what you should be doing is uncomfortable and can be unsettling.

So when you get emotional pain back, your subconscious thinks, okay, I"m used to this, I know what to do.