What’s wrong with me???

My boyfriend and I had broken up a while ago. Mainly due to his own personal issues. During our breakup I met another guy, no judgment, but we had sex twice. I loved every minute of it. And it didn’t take much for him to get me in the mood I recently got back with my boyfriend. We’ve had sex a few times but for some reason I can’t get in the mood?? Like I hate him kissing me, I hate him in my face, I don’t like when he touches me in certain areas, basically my response to him is completely different than what it was with this guy and I’m not sure why, I’m very much attracted to my boyfriend, I love him to death. So I’m not sure what it was or what it could be And of course my boyfriend gets down or discouraged because when he leans in for a kiss I turn my head away. And he feels terrible like he did something wrong It’s not everytime we have sex. We were together for 3 years before we broke up. It’s just been more so recently especially after encountering this other guy I’m not sure what to do 😞