Is my boyfriend being disrespectful, or am I just overreacting?

[prcsm]

He's 20, I'm 19, and we've been dating for a little over a year. I don't have Twitter, but he does, and I like to take a look at it sometimes. I don't think he knows I do. I've noticed that he follows random girls that went to our high school but he doesn't actually know them. I know he just does it because he thinks they're hot. There are a few other girls that went to different schools around my area, and some random ones I've never even heard of before. He isn't even friends with these girls on Facebook. Why is he doing this? What if they followed him back, which a few of them have, and they got talking? What is he trying to achieve? Am I not good enough for him? It's one thing to follow hot celebrities, which he does as well and that obviously doesn't bother me as much at all. Am I overreacting, or would you be weirded out by this too?