He man, you might just be a teen but I would suggest that you start building honesty in your relationship,with women, starting from now on. If this bothers you then tell her that shit. If you dont know how to read body laguage I suggest you look into it because it can help to know if shes lying or not. For example, if you tell her this and she doesnt face you and she turns her whole body away from you then thats a big ass (pun not intended) cue. Also, dont start shit with adriana unless you have evidence he is trying to get with your girl. And the shit you start would be breaking up with that girl. On to the next one.
The worse thing you can do is stay with her. I did that and regretted it. You're only delaying the inevitable.