I'm in my first year of college and I understand there's going to be a lot of LMR from girls but I can never close on them. No matter how successful my game is (i.e I don't put all the attention on her, isolate her, get her interested) I can never close the deal. An example of something that happened last night:

This girl thats partying with my friends sees my tattoo and asks what it says. I showed her and told her I have another one but I can only tell her in private. She begins to get really interested and begs me to show her. At this point I have my arms around the hips making good kino and she's responding well and agrees to go up to my room (mind you this is all in residence). Her friend even said good night to her and then last minute she decides to go back and party with my buddies again. At that point I didn't want to look too clingy so I left for a few minutes and came back and at that point she had left.

Can someone tell me what I could've done better to close the deal or point out any flaws?

Any help would be appreciated guys,

Cheers.