It IS his choice. The thing that makes me feel sad, is the fact that it isn't only hurting him, but 3 others as well.
Seriously, this is a LOVEforum. While your ideas may not be wrong in your head, they definatly aren't right either.
If you want help, you need to find someone who shares your belief. Which I don't think you will find that easily. While it seems normal to cheat, it still makes you an idiot.
I know I am a guy, and most likely shouldn't answer here, but if it was my girlfriend who was cheating with you, I would kill you. And I am not kidding.
Cheating is equal to molesting in my book. Me getting raped by you would hurt as much as it would hurt me to know you are cheating with my fiancee. If not less. And don't get me wrong, I'm not saying it is always the boys fault, cause the girl has just as much guilt in this as the boy has, unless we are talking about rape, which we obviously aren't. To me, it just sounds like you are the one making all the moves, which makes you the main villian.
I agree with the others on this, I don't want to be your accomplice either. You may be right that it is your life and your marriage, but remember you can't be married alone. Your wife will suffer when (not if!) she finds out, and by then i hope she cuts off your dick. A weak revenge, but hey, she have been your wife for 15 years right? so she may be kind to you. I already feel sorry for the poor lady. I fail to see how you can live with yourself. Why not try telling your wife? look for the reaktion? Hope(or pray) she doesn't cut off your dick? if you are (VERY) lucky, she may actually accept it. But keeping something like this behind her back CLEARLY shows you are neither serious about your marriage, nor mature enough to take responsibility. And most importantly, it shows you simply don't love your wife.
But, if you want to give her a romantic gift that will **** up You 4's life, why don't you try with a ring? propose to her. Why not? You seem to like her more than you love your wife anyway.
Sorry if I am being mean/evil, but that is just the way i react when i see idiots like you.