Is it weird to add a guy you barely know on Facebook?

I’ve talked to this guy maybe once or twice. He was in my class this semester. We seemed to get along well. I had the feeling that he was interested, and I’m really interested in getting to know him.

We would always make eye contact multiple times a day and just smile at each other. I would always catch him staring and his body language made it seem that he was interested. I kept waiting and waiting for him to ask me for my number but the semester ended and he never did. (I’m so stupid, why didn’t I ask him?!?!)

Anyways, is it weird if I add him and message him? I don’t want to seem creepy or like a stalker…