About 5 hours ago my boyfriend of 14 months told me that he has been cheating on me for the past 6 months. He said that he loves me and that sex with other guys means nothing to him; "it's just sex." He said he wants us to have an open relationship. I am very big on monogomy and have never cheated. I have also grown very fond of the guy over the course of our relationship. Break Up? or Let him sleep around? Just want to see what the group feeling is on here about monogomy.