Girl Issue and I don't know what to do at all?

I met Wendy when she joined the robotics team this year. Now I liked her from the get go. Her personality is phenomenal, she's smart, funny and attractive. But anyway...( before you judge harshly she's truly a great girl but has relationship issues...) She has a bf but didn't seem to like him too much when i met her. She would always talk about him and her and their issues. I added her as a friend on facebook, exchange cell #'s and we found ourselves talking to the wee hours of the night or all day about random things... mainly questions like comparison questions. She was chosen as well as me to go to Georgia for the robotics competition, so we go and I sit next to her the whole way down and up. When we were there in GA, she was really flirty. I was a little, but not much since I had respect for her current bf. So my "friend" decides in his mind "hey I like her too so I'll try to take her from "me"" So he starts flirting with her while down in GA as well. So I told her, look I sorta get jealous that Greg's semi- flirting with you. So she told me look I don't see us ever going out, he's just not my type. So i said ok, and forgot about it, yet he pushed the issue and continued to flirt with her. It aggravated me to no end to where I had to pull him to the side and tell him how it's bothering me. He CLAIMED to "understand" but well see that he didn't in the future later in the message. Her bf finds out that she was kissed by another guy and he dumps her for one day. She begs for his forgiveness and they go out again, then ever since she hasn't talked to me much at all and if I send a txt message she ignores it half the time? So, back to my "friend"... he ends up kissing her when i clearly told him to back off. I know she's not my gf yet at all, but there is a "rule" for being a friend. He knew I liked her and he still tried. The main question is idk what to do at all? She's at band camp for the whole summer and I'm sorta afraid to call her about it or talk to her when she comes back. I want to but she seems like she would get upset about it all. She told me once "if" one day her and her bf break up, I'll have a possibility with her. Now I know that sounds a bit sluttish but she's not a slut. I know it. She's just flirty. I really care for her, and talk to her as nice as i can. When I see her it's like the freakin highlight of my day =] But I also don't know if I can see a future with me and her because she don't talk to me much anymore? Sorry it's super long... I tried shorting it. please refrain from saying to move on. I know i might have to, but still I honestly love her. It's hard to explain.