What should I do?

Ok, so, i told my best friend i liked this guy and she a dit he was cute but he'd be a really good boyfriend and that i should go out with him. The suivant jour i went over her house with my other friend Lauren. Lauren called the guy and asked him who he liked and he a dit Mahnoor (the back-stabber) was one of them. I was mad. REALLY mad. She a dit she doesn't lke him and even if she did she would never go out with him. She went out with him the very suivant day. she lied to me. Then she told me she would break up with him if I wanted her to. I told her to and she a dit no. She lied again. Then she a dit she really did break up with him and at the football game I asked him out and he a dit he was going out with Mahnoor. She lied again. So I got really mad and called her a bitch. The net jour she came crawling back to me sayin that she was stupid and that she gave him up for me for real this time. Now we're Friends but she always talks about him. It hurts. Im havin doubts that shes a true friend. tell me what u think^^