Help With A Guy I Used To Like...?

Ok, long story short, I used to like this guy..a lot. I don't think he ever used to like me back. It was for about three years. Anyway I moved on to regular high school and he now goes to another high school. But the students of that school have to wait in my high school's lobby for their buses. Over the summer I had tried my best to move on, and I did. Until just recently when ever I come in the lobby his friends are standing, almost blocking the door way and he's with them. And today he was staring at me while I was talking to my friend Shay. Does this mean something? Or are they just being assholes? If they keep doing this, it's going to drive me crazy...plus it's embarassing.