I need some help to clear my mind.?

sounds like you should go with your gut feeling and break it off.like you said you both don't have anything in common any more.you don't want children and he does.yes you mention that he had nervous break down,but shouldn't stop you from making your life of being happy.you tell him that you love him,but a lot of things have changed in 7 years and you both don't want the same things in life.no this isn't being self fish.