How do I know she s not using me?

Ive become friends with my ex man's new girlfriend. Thing is he was a huge user and hustler and I think she sometimes helps him run his game. I know I used to help him :) anyway she has been wanting to hang with me but Ive also been taking her to the jail a couple days a week to see him since she has no car ...o yea he is in jail for a month lol. Well the other night she did my hair and makeup and we went out. we ended up getting a little messed up and making out! my first time with a girl! I loved it. But then I wondered if she is playing a game with me to get me to take her to see him. I asked her straight up "you just being nice to me to get to see Mike every week?" she laughed and said "shut up! why would I do your hair and take you out and give you extra gas money if I was playing you?? Maybe YOUR playing ME! LOL" then she invited me over to her sisters hot tub tonight :) what you think?