Um. ?????

Ok. So a little backstory. This spring break I went to New Orleans with my high schoolband. (Soooo much fun btw.) I hung out with my friends and Just chilled in the city. I just got back today (22nd-28th). But on the ride back home I overheard my two best friends, who were sitting behind me, mention my name. I quickly put earbuds in and listened to them. I heard them talkingabout relationships and dating people. It would seem like normal girl talk, but neither of them have boyfriends or girlfriends. Then I heard Gwen mention a girl and dating. This really surprised me because the person she was talking to was Gianna, the first and only girl who I have ever truly had a major major crush on. At first, I thought it was that Gwen was talking about how I liked Gianna, then thought that Gwen was convincing Gianna to ask me out. As I listened further, I relized that Gianna was going to ask me out and wanted Gwen's advice about it. Shocked and a little scared, I looked forward and pretended that I couldn't hear anything. When they asked me if I heard anything, they seemed pretty convinced when I said that I was blasting music and couldn't hear anything around me. I HAVE been known for being a great actress. Ok. So here is my problem. If this was happening anytime before 2 weeks ago, I would say "yes" and be very happy in a heartbeat. But now, I don't like Gianna in that way anymore. After 3 years of being in love and not getting anywhere with her, I have given up. So, the question is; should I give it one more chance and risk getting hurt again. Or should I just let things lie and say "no" to her?