Most Helpful Guy
Best to go no contact and move on. Use "no contact" to heal yourself. Erase everything about him from your life (phone number, texts, pictures, etc). because it seems like the more you worry about him the more it's hurting you. Obviously it shows from his past that he isn't trust worthy. You tried to be there for him during his depression but thing changed and now he is ignoring you.
You can only do so much my dear. The problem is him not you. He needs to figure himself out and the mistakes he made. If he can't do that then how can he be there for you when you need him. Yes no contact will hurt at first because of the time and effort you put into a relationship, but it will help you recover from pain faster. Let time do it's thing. Focus on you in the meantime. hangout with your girlfriends, get a new hair style, etc.
You never know when someone else will walk into your life and treat you better. If someone else does make him realize what he missed out on.