Am I looking into it too deep or is there something there

So when we first started dating my boyfriend let me go to parties and stuff with my friends. Since he's went to college he doesn't let me meet any of his friends. The only time I ever meet his friends is if we pass them on the street. Last night we were gonna go to a Halloween party and it was the first one I was able to go to with my parents permission. My mom was excited for me to experience it. Him not so much. He already had it in his mind made up that he didn't want to go and he brought up that he's scared I will cheat on him. I've been nothing but loyal to him. I think it's weird he use to go out and stuff and out of no where he doesn't want me going out to a party and I think it's because he's scared I will run into something or someone. Point blank I didn't get to go