Women, what is this girl trying to pull?

Her name is Lindsey. We're just talking. I went to a club last night. She tells me she misses me and wants to come over afterwards. I was honest and told her how a girl tried to kiss me and she got upset. I told her that I didn't do it and that I liked her. Then her friend Amanda messages me and says hey y. I tell her hey cutie and suddenly Amanda goes off on me and says she's drunk, but that i'm an and that theres another guy Lindsey is talking to that is so much better than I am. We agreed we could see other people, but I told her if I did. I asked her and she apologized. She kept probing to see how I felt and I told her I liked her a lot. She told me she liked me a lot too and cared about me. I was upset. Not jealous, I just hate liars. Well, on and off she would go back and forth telling me how much she liked me, but when I would get mad she'd say something like the she has a boyfriend now and it's too late, but it seemed like she was just saying that to make me mad. Anyway, I told her I had to go to bed and that she ruined everything for us. She tells me the other guys is great anyway, but then when I woke up this morning and saw that she sent me a last message that just said "Hey..." 30 minutes after I said I was going to bed. I have no idea what this girl is doing!! Please help me out!