So me and my ex boyfriend were dating for almost a year and a half and I broke up 6/24/16 because he changed so much; he became very angry, overall unhappy, super negative, judgmental, antisocial, and so selfish when it came to the two of us and I am the complete opposite of all those things  so I just wasnt into him anymore. But two days after we broke up I had sex with a guy that I always had a thing for since we talked before a very long time and we're best friends at one point. My ex was crying and begging for me back but I just can't. Am I bogus for having sex with someone else so soon???