Hi Jenkins,
You have been given much good advice here, I would like to add something as a sufferer. Being a sufferer there are times when I need my space from everyone. When married that is a little tough, but my husband has learned to give it to me as much as possible. My good friends understand that I may totally withdraw for weeks or months at a time. If I tell someone that I don't want contact right now, I mean it. When someone makes the decision for me that it is unhealthy and keeps pushing all it does is push me away completely. If I say "no contact", I mean no contact. I do understand that it can be confusing, but my friends who know I have PTSD respect that space is something I must have.
Reading about how you are holding on really concerns me for you. While you x-bf may need space, it is NOT OK for him to keep stringing you along like he has. Your relationship sounds very co-dependent to me an that is unhealthy for both of you.You have said that you will let him go completely so that he can heal. Maybe you need to do this for yourself too? You need to take care of yourself, you deserve a happy life.
If you are to continue a relationship with him, I think LB is right on in saying to just be a friend. It would remove a lot of stress and expectations. Of course that may not be possible when you've been romantically involved.
Our oldest son was in a relationship with a girl we all loved, but who we found out later was bi-polar which explained much of her bizarre behavior. He and I discussed how dysfunctional their relationship was and how it was affecting him negatively. He truly loved her and wanted to stick by her like his father has done with me for 33 years. I told him that dating is to determine if a couple is compatible and to see if you are good for eachother. She was obviously NOT good for him (remember I do love her) and that he should end it. He didn't and held on for the better part of 4 years. The relationship became physically and emotionally abusive. He just barely made it thru college (on an academic shcolarship), but destroyed his automatic admission into law school because he was so stressed out dealing with her. They did eventually break up and he now says he wished he had listened to me.
I tell you this only to say that you are not married to him, you may love him, but that doesn't mean he is the person that you should be with for the rest of your life. I firmly believe that you should not be with someone hoping they will change anything, I mean anything, about themselves. You are setting yourself up for disappointment if you do.
Please take everything I say with a grain of salt. I do not know your situation other than what you have shared here and I certainly am not a professional.