Thanks to everyone for your opinion.....so many different views and it is helping me sort things out in my head. It kind of hit the fan this weekend....I saw a pic of her with her ex and daughter while in NY and his arm was around her and resting on the top of her butt. After seeing the pic i just can't believe a word she says about not sleeping with him. So I told her that I just can't believe her and she is free to do whatever she wants and we should date other people. No exclusivity. I think this will kill the relationship but I just can't believe her anymore and so cannot continue to be in an exclusive relationship. Thanks everyone for the feedback and your viewpoints!!