Most Helpful Guy
I never break up with someone without a valid reason. I would feel bad, f course. But I'd try to be as cordial about it, so as to not make her feel too bad. I might miss her a bit too.
On the other hand, if she broke up with me, I would cut her out of my life that instant, and she would just be a stranger to me from that point onwards. I wouldn't want to have anything to do with her, and I would hope that I never have to see her again in my life. And no question of 'missing' someone who thought I was not good enough for her./