Ok... So here's the deal. I was on a break with my now ex-girlfriend last summer. I worked with a girl who I really liked. We started hanging out and eventually started hooking up. When we went back to college we kind of left things open and said we will take things as they come (2 different schools by the way). I ended up getting back together with my girlfriend (big fucking mistake) and kind of brushed off the girl from the summer (big fucking mistake #2). Fast forward through the year and my girlfriend breaks up with me right before we come home for the summer. It turns out that the girl from the previous summer is working with me again. We start talking and one of her friends tells me that she has been "seeing someone" during the year. She ends up coming to a party of mine and kisses me before she leaves. We start talking more/going to dinner (one on one) and making flirty comments towards each other. When I was honest and told her that I still had feelings, she told me that the feelings that she had aren't there for her anymore. What she says makes me believe that the feelings are gone for her but what she actually does (texts/calls me/asks for favors/flirts) leads me to believe that she might have feelings still. How do I go about dealing with this shitty situation? I don't know wheather to play it cool and don't text her or try to chill with her, or take the other approach and always be flirting with her/trying to forward my progress.

P.s. she never once mentioned the fact that she has a boyfriend to me regardless if she already might know that i'm aware of it.

THANKS FOR THE HELP GUYS