She suddenly acts really uncomfortable around me?

I can't figure out if I did something. She used to be friendly and really nice to me then she started dating some guy and now she acts really weird around me.

I would just ignore her except she keeps walking over to come hang out with my friends, other guys, and jokes around and is friendly with them. But with me she acts uneasy and is sort of rude. Its bothering me because its making me feel weird and I can't avoid being around her.

I dont know if she thinks I like her. I wonder if its that since it started when she met a guy. Or if I did something creepy or what. I've never hit on her or anything.
She suddenly acts really uncomfortable around me?
Post Opinion