Should I stick around this affair?

I’m a 21-yr old woman, having an affair with a 45-yr old man. He’s been married for 5 years with no kids. His wife, she’s 27, treats him terribly, but they work together politically and have a sort of forced relationship. They haven’t had sex in over 7 months, and before that only had sex every few months. He and I were together for 2 months before we were able to have sex, and now we have it a lot. Even before we were sexually involved, we had a pretty intense emotional affair. He’s just coming to the realization that I really do love him, and that I really do want to be with him (he didn’t believe me, thought it was too good to be true, etc.). He’s no longer romantically involved with his wife, we spend at least 12 hours of every day together, and we never get tired of each other…he’s introduced me to a lot of his friends, wishes he could take me to meet his family (has told one of his brothers about us), and he’s good friends with my sister and her boyfriend and everyone in my communal household. He’s starting to talk more and more about us being together forever, and I really, really want that to happen. So my question is, how stupid am I? Do these things ever end well, is it feasible that we could end up together? Could he actually love me? Alright, thanks to anyone who answers!