I know where you are coming from because I was in situation with a married woman. Honestly it was a horrible experience after all said and done. When I was in the relationship, I was always haunted by my moral conscience. I new I should not have been involved but I rationalized and made black seem like white, when in fact I was blinded by the darkness of it all. In the end, I ended up getting hurt after she ended it and went back to her husband. I realized I played with fire and I got burned. Don't let it happen to you. If I was in your shoes I would get the hell out of the relationship because it is not what you think it is, regardless of your feelings for him. In my opinion what he is doing is wrong and has no good excuse for cheating on his wife and kids. You are also doing the same to his kids and wife. If you guys did try to hook up in the end, his kids will never accept you. After all you will be seen as the bad girl who broke up their parents. Becareful, you don't want to get burned emotionally nor spiritually. the latter being the worst imaginable. just my opinion.good luck