I usually don't even read these off topic posts, hope I am not intruding.
I am older and wiser
but still a romantic at heart.
If I were you I would try to separate two completely different issues. One...he is married. Two...he is attracted to you.
He needs to deal with the first issue before you can even "talk" about the two of you. The last thing you want to do is get in the middle of his stuff. even if it worked out, you would carry that with you.
Tell him to figure out what is best for him and call you once his life is in order. Don't be his excuse.
Sorry if that sounds harsh. There are many couples that get back together and even remarry. It could happen for you some day too. Best wishes