Fed of of playing relationship mind games

Ill keep this short but basically, I'm just so sick and tired of playing the game where you try and make each other jealous enough until one of you breaks.

I was out clubbing on Friday night and this girl I've been on a few dates with starts dancing suggestively with another older guy from the same Hall. I'm pretty sure she was all over him aswell.. It's just, OKAY I acknowledge that we're not going out but dancing with a guy RIGHT infront of me in the same club is real lame.

And right now, I'm temporarily experiencing low self-esteem because of this. However, this may be due to the fact that I'm hungover and it's a sunday.