Gossamer, Make sure you don't make any of the mistakes I outline in the chapter on depression.
Are you contacting him or is he contacting you? What does he say he wants to do at this point?
When someone blames him or herself completely, it creates a problem because then there's nothing YOU can do to make things better. It would be helpful if he could identify what about your relationship he found challenging. Then you would know what to change or work on. Maybe you already have an idea of what he'd say about that. Michele