@Eliusa,
It seems you all missed one significant thing is that we are still married to other people.
http://able2know.org/topic/252769-4
I don't know how many times people are going to tell you to LEAVE and then find out. This guy is either going to be good for you, have sex and leave you, keep you in an affair of sorts and hurt you, who knows?
You can't have your cake and eat it to Eliusa. If it doesn't work out and you lose your Husband, so be it.
Your Husband does not deserve to have a wife, currently emotionally cheating and possibly ever so small, physically cheating with the intent to fully want to cheat even though you've made the "suggestion" to him that you will.
It's not all about you. Sorry.