Who thinks she is using me ...or is she really into me?

This woman and I dated the same guy. Well he is my good friend and her on/off boyfriend. He just got locked up and we have decided to kinda band together and visit him every week and help him however we can...that is until lately. The last couple weeks we have not been visiting him or taking his calls. What has been happening? She invites me over to take her to go see him. But we end up just hangout at her place...smokin up and she gives me make overs or we watch moves and talk about what a piece of crap he really is. NOt only that but we started experimenting UALLY and now she says we are girlfriends! lol. We got a hotel and had the other night. MY FIRST TIME WITH A WOMAN. I just want to be careful cuz I am falling for her and I want make sure she's not just using me to get to him or whatever. lol altho we've been blowing off visiting him and ignoring his calls LOL