Your worth does not rest on this guy's shoulders. You determine your worth. He could have been man enough to not betray your trust, and to tell you that this is a situation he could not handle, but he didn't. That says a lot more about him then it does you. So though I know it's hard, put that situation aside. It has nothing to do with you and you don't need to waste any more time on that guy. Don't be someone's option.
As for your disorders, I understand. I have severe depression from trauma that I have never dealt with. You can be a productive human being, regardless. You have to find the will. I stongly suggest getting B12 supplements on top of any recommended prescriptions. This has helped me immensely.
Best wishes