Boyfriend hates my high school best friend

So my best friend from high school was kind of a shitty friend, but I kept him around because he was entertaining and good to talk to. Plus, nobody else would really hang out with me back then. I just had to accept that he was only going to care about me when he needed something, and I was okay with that.

Recently, we reconnected and he seems like he's a lot nicer. I don't think there's anything he would want from me right now, and he was still being really kind. It makes me think that he's changed. My boyfriend hates the idea of me becoming friends with him again. I invited my friend over for the weekend and my boyfriend is going out of town to avoid him. He says it's a bad idea and he's just gonna use me again. But he's really fun and I miss fun.

BTW I don't think it's a jealousy thing. My boyfriend knows that my friend is very gay and would never be interested in me.