Most Helpful Girl
Sounds a lot like what I said to my ex when we were breaking up. Best thing you can do is express that you love her and care about her well being. Don't guilt or pressure her or you'll push her away.
Most Helpful Guy
She might be going through something and assumed it was too personal to talk to you about. Don't fret. Remain friends but don't get hung up on her.
If it turns out she is interested in someone else drop her ass and never talk to her again.
Get on with your life. It will be hard at first but eventually you'll be better for it and if she ever asks why you were non-chalant about the whole break up, don't bother replying back.
Get on with your own life.
People come and go in life. Your young (and now free) to enjoy meeting new people and creating more relationships with others wether it be love or friends.