I’m confused

Jay

Me and my boyfriend broke up about a month ago almost two months. He told me he wanted to see other people and he wasn’t happy with me for a year. Now we have been having sex and we both told each other it’s just sex. So he finds out that I’m talking to someone else and he’s going crazy. Asking 101 questions about the guy and is he better . I haven’t even hung out with this guy I just started messaging him. I didn’t say anything to him when he was talking to someone because it’s like okay we aren’t together you do you . So why can’t I do me?

Why break up with me ? if you’re acting like this ?