I understand well how your trust is broken after all the failed relationships and the girls that were cheating on you behind your back. Of course I can imagine how much you'll have to live in fear after we've been dating for a month now - every time I'm going out on my own, you thing I'll be also cheating on you. No, honey, I'll do nothing behind your back. I will truly be honest with you! You know, I need to fuck other men, but you always will know and can watch our sex games, so it's no secret and I'll never lie! This way I'll help you out of your bad thoughts!
You lucky guy, you have a hot girlfriend called Vivien! But you've been wholy unable to live up to her. She is tired of being unsatified in the bedroom, an so turned off by how submissive you are to her. She's just going to have to get a new lover, and you are going to have to watch while she has hot sex with... her. Yeah, she's going to cheat on you with a girl.