I can feel your pain. Rejection is hard to swallow for me and I suffered from the same thing you are talking about. He is telling you the truth about himself. He probably is messed up and he is uncertain what he wants right now. It would be better to know that he is seeking help but you can not change him but only yourself. It sounds like you are having to face being alone and you are feeling very lost. I have been there and it is a tough place to be in but it takes time for him and you to see where this all goes. If you believe in God this would be a good time to seek Him for your comfort and direction in life. Friends mean well and we all try to figure out why! No matter what he is going through right now it is important that you realize how important you are and that you have family and friends and most of all God to lean on. Take a day at a time.
You are not alone.