Should I breakup with him?

Well, you simply need to do what makes you happy.. and it seems that staying with him isnt going to do that for you. You are confused, and thats normal for a relationship that has gone on that long, it is naturally hard to break bonds that you are used to. But... I think you should break up with him... or, better yet, take a break, see if he really means alot to you like he used to. You will either realize that you dont, and eventually find someone else, or you will see how you miss him, and come back happier for it.

If he has cheated u, then he is not worth of thinking. I understand certain bonds are difficult to forget but there is nothing which is permanent in the world. everything has to end sometime or other. U will find another person better than him, darling. Cheers!!

I would break up with him. If you're not feeling anything at all for him anymore, that's a big sign that your heart isn't with him any longer. And plus, he really screwed up with the cheating. If he's willing to cheat on you, then what's to say he won't do it again? If he really loved you, he wouldn't have cheated on you. His mind was elsewhere and you deserve someone who treats YOU like a queen. You shouldn't feel empty.Memories are really nice, but it's also good to have new memories being made, and it seems to me all you have are old memories at this point.