Okay so here's a quick backstory:
I started talking to this girl about 3 weeks ago, she goes to the same school, im grade 12 shes grade 11. Probably a 8. So we've talked alot in person, but dont really text too much, mostly to plan when were going to chill. So the first two times went good. First time chillin we had a fire in the back yard and then went for a walk, lots of light Kino. Mostly things like rubbing up against each other all night. Drove her home after the walk, it was around midnight. Second time chilling she invighted me to go see a funny movie. That also went well, I had my arm around her and she was snuggled up too me the entire movie. And this is where I get completely lost... So the next time we chill which is like 3 days later, were at a party.
So I'm mostly talking to my friends and a bunch of other people for the first hour, after this I see her and we talk and stuff and I brush up against her butt and back every couple minutes. We talked and planned on going mini golfing 4 days later.. After we talk for about 15 minutes we go our separate ways because I needed a drink and she had to go to the washroom. I see her again in about an hour and shes pretty drunk and theres this guy all over her and she goes along with it.. Didnt hook up with him she said. I was supposed to walk her home but she insisted on staying even though the party was over.. I think it was because this guy was still there. So I just said okay whatever and left (Didn't make a big deal over it). She text me the next day saying it was dumb of her to like rubbing up against the guy and all the jazz, I said "Okay, I was having fun entertaining the rest of the party anyhow

" and that went over good.
Then 2 nights ago we went to another party where she was a little drunk and I drove us (my friend and her and her friend) to the party. We talked for a little while and then we went our separate ways and she dissapeared for like 2 hours and went to some guys tent. She said once she got out that they are good friends and they were just talking. When we were walking home we were holding hands and having a deep conversation and it was fantastic till we got to me car to drive the rest of the way, about 5 minute drive. She was in the back seat with my friend and he told me afterwards that she was trying to cuddle with him most of the time. she had her hand on his stomach and stuff like that.
I thought we had a thing going on, but what would you guys say about this. Is it okay because we've only hung out like 4 times. Or should I just end the whole thing? I really like her when shes sober and shes so easy to talk to. But its at partys where she turns into a whole different person. Any tips on where to go from here?