Wow I'm so shocked at all of the people who said to keep going for it while he even had a girlfriend... like seriously? How would you feel if you boyfriend/girlfriend was off fucking one of their friends behind your back? Yet you tell someone to keep doing it because they are living the stereotypical "straight guy lets me suck him/fucks me" fantasy? He ain't straight, maybe bi. Who know's at this point. But just wow, sorry for sounding harsh but that is the worst advice ever to give someone, and the poor girl is the only one anyone should feel sorry for at in this mess. And you being the "guy on the side" just shows you have no care for anyone's feeling in the situation. You should have said no, or "break it off with the girl before I do anything with you" And I'm sorry but if you get hurt I couldn't say I'd feel bad for you. You kinda deserve it, because if the girls ever find out, they would feel way worse than what you feel. You need to step back and STOP. If he even begs you still need to say no. I'm not trying to bash you, but I'm giving you REAL advice. Put yourself in his wife's shoes. You may be jealous of her, but how can you be jealous of anyone who is being played even more than you are. She is obviously in love with him too, but he actually says he's in love with her too and wants to spend his life with her, so he says. She is being assured she has met the one and he feels the same. And he is going behind her back with you. And you know he doesn't feel that way about you and he probably never will. So in reality she should be jealous of you because you are going to be the one less hurt in this situation. Her trust will be destroyed, she'll always wonder if her other boyfriends are gay/bi, cheating. And what if they have kids? You would be the helping hand in ruining at least 2 people's lives. You need to end it for good. Step back and give yourself distance, because you will start to see he is playing you and you are honestly an idiot for allowing it. If you don't think you deserve at least more than what you are having with him then good luck. I think its messed up, and sorry for being harsh, but it needs to be said. If this is true, which I hope its not, think of the wife. She's already with someone who's living a lie. And he isn't ready to stop living that lie. And I suggest not letting him fuck you raw because who know's who else he's fucking and who those people are fucking. You don't want to ruin your life for anyone, let alone this guy. I predict if this is true, you will continue doing you, but you need to realize this is no longer two adults having casual sex, in this case one adult using an easy fuck, you. And both of you betraying that girl who is probably the happiest person right now, and walking into a situation where her heart will most likely get demolished. This isn't how it started, and you know what it is. Walk away, if not, you will not be allowed to cry when a guy tells you he loves you but is cheating on you. Again, sorry for being harsh, but it needed to be said years ago. Good luck in life, and i hope you don't end up with any STDs.