You were right to suggest he see a therapist. I believe he actually needs a psychiatrist perhaps for meds. His depression sounds deep. As a depressive person, I understand how he feels somewhat. There are days when I don't know what I want or even who I really am. I push loved ones away because relationships take up too much energy. Energy I need just to keep myself going. I doubt he has any idea how he feels or it changes daily. Until he is ready to get help he is not going to get better. I'm sorry that means you lost your relationship with him. Depression wrecks lives.