Well here is my situation, me and my girlfriend has had some problems before. I guess it started after high school when we ended up going to two different colleges, 2 hours away from each other. She broke up with me in four day into the semester. I thought everything was good. 3 months later I recovered when she came back in tears asking me to take her back. Well I did and now we're having problems again. The first problem is that she just doesn't want to have sex anymore. It feels like I'm constantly getting rejected. And now she tells me she doesn't know what she wants anymore. I don't know what to do or tell her.

If you can help me out I would really appreciate it.

Before you get to excited, know I'm 16. Maybe she's tiered of the same old thing all the time.not wanting to have sex with you is a sign of board om. Perhaps she wants to venture out and meet other guys but when ever she does she winds up missing you or possibly using you as a rebound for what ever doesn't work out for her. Try talking to her and ask if she want to save the relationship or not. If not then you should venture out too and have some fun, even though you clearly love her, sometimes its best to move on. What you have been waiting for could be just around the corner.

She came back in tears - she thinks has to have a man but failed elsewhere. She doesn't really want you. You had your problems all along, you said. Someday you will find someone you are more sympatico with. That's not to say that all relationships aren't work, they ALL require good communication and compromise.
Either tell her that she should learn how to be her own woman and gain some strength alone, or you both need to sit down and work on what you can salvage from all your problems with each other.

Well I asked her if it would be best if we just ended it. At a point it was like she was trying to say its over in between the sobs but in the end she said she couldn't. She said " i can't break up with you, it justs hurts." I really don't know what to do or say. I don't want to lose her again. But that may be for the best.

If she cries at the thought of coming back to you, and the thought of breaking up with you, without anything about making it work, then she is just too depressed about her life to have a man. You are going to have to break up as gently as you can, and suggest that she get help. She probably doesn't even realize that she is depressed. Tell her that you care about her, but that you want someone who can love you, including intimacy.

She has low interest. Be a man and cut her loose for your own emotional well being. Really do you need or want constant confusion, up and down emotions and not knowing where you stand?

Do you want to feel rejected? Do you want to be in this situation in five years?

Sit her down and honestly say to her how you feel then finish things. Life is to short to be miserable and inconsistent. Be strong!