How to get through a relationship with Depression?

I was living with my boyfriend for 9 months, and we were so in love. I knew he has some issues when we first started dating. His parents both passed away when he was 16 and 17. Both very suddenly. He never would talk much about it, but he did share things here and there. He then bought a house, and we moved in. Right away he started construction on it, and we had roomates move in to help pay for mortgage and furnishings. He would have days where he would "shut down" and we just would not talk that much, when I would ask he would say he had alot on his mind. Then last week I noticed for 2 weeks, he had been in this shut down mode. He stopped working out, he didn't eat much, we never communicated, he always said he was thinking about alot. Then when I made him talk to me, he admitted that he was in way over his head. He was stressed with the house and finances, he was stressed with work, and taking his last 2 classes to get his masters. He even thought about suicide, and drinking every day. This scared him because his mom was a heavy drinker and that is how she died. He noticed he was at an all new low. He said he needed to clear everything out of his life and work on himself, and ended things with me. Naturally I am devastated. I loved him. I still do so much. I moved out the next day. He said he was going to go to counseling, and that he needed to make himself happy. He said he would call me if anything changed, but until then he wants no contact with me, he cant focus on himself if hes worried about me or focusing on a relationship. I do not know what to do. I think he needs people, he has no family. I dont want to be shut out, but Im afraid if I keep trying he will get upset and never try to contact me later on. I want to respect him and give him his space, but I worry every night, I need him too. What do I do? Do I completely not talk to him and hope one day down the road I hear from him? Do I lay low and give him space but every once in awhile send a card to show I am still here and still love him? I want him in my life. I am afraid if he gets help he will not want me back in the end, or he wont get help, he will remove some stress and think he is ok and isnt and find another girl and keep going through this pattern. AHHHH so torn. I just want him back!