My mental health is crutical?

[Daniel]

There was a girl I liked last year (9th grade), and started talking to. I just got transferred out of the only class I had with her, so I only really talked to her on Facebook. I asked her out EXTREMELY prematurely. She responded with a no. It was extremely awkward, and after my friends also IM'ed her asking, she got kinda annoyed/ creeped out with me. A few months later, I developed feelings for her again, so I tried talking to her. One day, her friends and my friends tried forcing us to talk to one another, and she ran away. Little did I know, somebody put a sex note in her locker, signed my name. Early next year, a friend of her convinced her it wasn't from me. She then randomly smiled at me one day, and later that week I commented on a facebook picture of hers. I IM'ed her later that week with a Biology question (That was my excuse) and we talked a bit. She waved at me in the halls later that week. We talked more on facebook and so on. I then realized, in the middle of "IM's" she would just kinda ditch me and stop responding. I then found out she liked this guy who was obsessed with her. Knowing that there was a good chance they would go out, I just decided to be done with her. Walking down the halls one week, i noticed the spot where she usually hangs out with her friends. I was going to turn around, but she didn't seem to be there, so I went along. She apparently was there, because as I saw her I kept walking, but she then kinda put her arm around me. She then said "hi" in which I waved as she walked away. I approached her later that week and we had our first face to face conversation. I want to be her friend, but I cant set aside the feelings I have for her. Also, she is now in a relationship with that one guy. He goes to a different high school, and they don't seem TOO close though. He keeps posting really creepy status's, and I think she'll soon do something about it. Also, I really don't respect when she just leaves a convo. She does it to her other friends too though. What should I do? I try to end it in my head, but I can't come to it. There are also two other girls im interested in, but my relationship with her is almost like an emotional bond. I really really need help. My friends don't have much more to say, and watching this relationship happen hurts me extremely bad. This is one of those things, I need to do for my own purpose of maintaining sanity. I honestly wish she never smiled at me in that hall that day. Thinking of her has taking up too much of my time. Should I tell her how I feel? If I do, how do I approach her, and what should I say? I just joined the same boxing gym as her boyfriend, and although he isnt in my class i probably will run into him soon. It will be extremely awkward if he hears I told her. Also, if I tell her, then her relationship dies out shortly after, I would have made a big mistake seeing as how I could of waited, although it doesnt feel like I really can. I also recently befriended her best friend, and another friend of hers who she is currently butting heads with. What do I do?