it's completely up to you what you do. I guess purely dating this man and not getting into a sexual relationship all seems harmless enough, but no matter how much self control you have, feelings will develop, it's natural. This guy obviously loves his wife, or he wouldn't still be with her, you need to be able to accept the fact that he only wants one thing from you and that's all. He certainly won't let it get too serious or start spending lengthy amounts of time with you in fear of ruining his marriage. Men who cheat on their wives make me quite angry, as I have always believed in monogomy. Cheating is dishonest and if his wife found out she would be so hurt and her life would be completely ruined. It's really up to you to make your own decision nictra, but you need to look at the consequences and consider others who could possibly be hurt.
I would'n do it ! What goes around comes around ! Belive that and you don't know what crazy whife will get you back, it just looks like a lot of trouble and a lot of stress , that you can just do whitout !
But than again it's your desicion.
Do what you prefer to do. Just dont think this guy might be the one. He is married. Take it from me...A guy. By cheating he really doesnt care about his wife....He just wants play bc he is sexually frustrated...And he wont care about you.