What reason would hurt you the most if someone were to break up with you?

In this case I'm not talking about ghosting or you breaking up with them. I am curious what reason would hurt the most if they left you. Maybe it has something to do with your personality? Maybe they found someone new?

So how about you? What would be the most crushing thing to hear in that case?
What reason would hurt you the most if someone were to break up with you?
Post Opinion