I feel like this crazy/jealous/obsessively paranoid girlfriend thing is literally becoming a new trend among teenage girls or something. This is the kind of behavior that leads to you getting cucked later down the line because she "wanted your attention".
Well that's unsettling, my girlfriend jumps the gun and assumes the worst from me before I have time to explain anything, she'll assume I'm into different girls or something and gets really paranoid. It was flattering at first but now that I think about it, she might need to be a little less clingy.
OT:
OP you definitely did the right thing, I don't know you in the slightest but you don't deserve that kind of stuff, especially from your own "girlfriend." forget her, move on and get with someone who can actually understand and love you like one should.
goodluck my dude.