Wow that is quite a story and sticky situation you are in. I have been through a world wind of stuff myself. It is too much to go into right now so I am just going to cut to the chase. It is not easy when you have mind blowing sex with someone and you fall for them and they are with someone else. Truth be told if he could go through with marrying his girlfriend then he doesn't love you. He might like you and have a good time with you but if he thinks that you and him don't have a real future together then that is why he is not willing to jeopardize the relationship that he has with his girlfriend. Do I think it is wrong to sleep with someone that is married yes if everyone doesn't know about it. If everyone knows and gives their consent then that is different because it gives everyone involved an option to get out of the relationship if they don't agree with what is going on. I think that when you really care about someone that the right thing to do is to be honest with them about your true feelings.I was in a situation in which I was madly in love with one man but I was married to another.I slept with them both but the man that was my Ex I slept with years before I married my Husband. We had lost contact over the years and I had found him on MySpace one day. I never got over my feelings for him so when I married my Husband I had quite a mess to clean up as you can imagine. It turned out that the man that I was madly in love with had gotten married to another woman. To make a long story short I met his wife and we started talking. I found out that he treats her like garbage and that he is an abusive jerk. It made me see him in a different light that is making me reevaluate my feelings for him. Now I am left picking up the pieces of a broken heart. I am still married to my Husband and I am starting to appreciate him more and more each day. Now that I know what some other men are like I realize what an angel I have. Like you I am in my thirties. I am 31. I got married young as well so I understand what it is like to think that you are ready to settle down and then one day someone comes along and makes you realize things that you missed out by getting married so young.It won't be easy but I think you should stop having sex with this guy. It is the only way for you to value yourself and to give him the option of changing things around.If he cares about you then he will tell his wife about you.If you are still married then you might want to work on your marriage and let everything else go. In the end you have to decide what is really important to you.Sex is great I am a big advocate however it is all that you have it is not going to provide you with the lasting joy and satisfaction that you are looking for.I wish you the best of luck.