What's the Deal?

So I went back to my old high school for the homecoming game to see some people I hadn't seen in a while...and I get into a clump of my old classmates, and they're like, "Yeah P, we heard you were gay. I mean we're okay with it and all, you could've just told us." So I was like, "WTF, mate?" Turns out this girl I had been dating a while back has been talking a bunch of crap on top of telling everyone I'm gay...??? Our previous situation was fantastic, probably one of the most awesome relationships either of us had. Would somebody (especially a girl) give some insight on this? I've even talked to her twice before saying she should just drop all the crap talk and both times she's agreed and said it was stupid and hugged me and all this such crap...

So what's the verdict? Is she pissed because we had something great and it didn't work out? (She broke it w/ me). Or is it jealousy? Or is it that she's just messed up? Haha, info. would be appreciated.

~P