Please answer if you see! Guy problem I gotta fix tommorow!?

[steepcrook877]

Long story short. Me and the guy i've had a crush on for ages started texting on the phone and calling eachother at the beggining of september (JUST AS FRIENDS) before he had a gf we both had crushy feelings for eachother. And so a week ago his gf found out we were talking and did not like it. And cause she is a big breasted, cheerleader with an outgoing personality, we stopped talking. He said it was because I was "Trying to break them up." WTF. I didn't even know he had a gf! I hadn't seen him all summer when their relationship started and I don't have a facebook, so how the hell am I supposed to know? So now whenever i'm around with my girls his group of friends and him all turn to stare at me and some of them smile or smirk. Then when he sees me when he's all alone he stares with a blank sometimes angry face.
Three Questions.

1. Why would he say I was trying to break them up?
2. Why are they staring?
3. What's his deal?

And no remarks telling me to get over him or stuff. I know I should already or until they're over. I'm just curious! Thanks!