What do you think about this?

Ok, so I have a friend that's a girl, and she is gay. She likes girls because one day I saw her kiss a girl, and she always talks about this girl. Me and her are friends. Im a guy by the way. On the school bus, she always sits with me, touches me, gets too close to me, puts her head on my shoulder on the way to school or back, she tells me to keep her warm, by wrapping my arm around her. When she hugs me, she hugs me hard, so yea one day she put her breast in front of me when she hugged me, and I touched them by accident 2 times and she did not said anything. One day when I had my arm around her she bit my hand. I did not do anything, I was just listening to my music. I'm straight. I don't have feelings for her, I just see her as a friend. We are not boy friend and girl friend, just friends, best friends I think. I don't do anything, I just listen to my music, and she comes up to me and does all these things. I all do is talk to her. So what do yall think of this? Give me our opinion. Serious answers please. 10 Points, Thanks.