My best friend and I aren't friends anymore. What should I do?

[Dequon]

My best friend (who is a girl. I'm a guy.) and I were the best of friends. From the day we met, we connected very well and quickly became bff's. We talked everyday often until 2, 3 A.M. We were very affectionate towards each other saying how much we loved each other (as friends. Though she did mention us hooking up. We never did.) She often told me how amazing I was and how much I make her smile and make her day. Typical stuff a best friend wants to hear. I truly loved and care about her. I'd be there for her for anything and put her happiness above my own. A little while ago, I noticed she was different. Distant. Less cheerful (she was usually ecstatic to talk to me). I brought it up but she brushed it off. Then the very next day is when she decided to cut me completely out of her life. She's ignored my messages and unfollowed me in Twitter and defriended me on facebook. It's been about 5 weeks since it happened, and it hurts every single day. The first few days after it happened, I was just like a robot. Went through the motions of daily living but I wasn't really there. I was totally out of it. It doesn't hurt as much as it did then, but it still torments me every single day. The fact that I don't know why she did it is the main reason why I can't move on. She was so sweet and caring this just isn't like her.. A little before the incident, she brought up a boy and how she never liked anyone so quickly. He played her, there was another girl he's going with but he told her he wouldn't mind her company just not right now. She cried a lot over him rejecting her but still likes him ( she did when we were still friends). Maybe she cut me off because there was an attraction between us and she doesn't want it to affect her chances with this guy? Some guy is no excuse to betray a best friend though...So what should I do? I probably sound like a fool by saying this, but I want her back. Our friendship is very important to me. Should I confront her or forget her?

[Marina del Rey]

great details but i hope you understand without ages a half way proper reply is difficult just go on with your life as shxx does happen