Depressed ex broke up with me. I want him back.

My boyfriend just broke up with me this past week. We had been dating for five months. He's 20 and I'm 19(f). I believe it is due to depression because he sleeps 12+ hours a day, he's irritable and moody, and he once told me a doctor tried to put him on medication for it before but he turned it down because "it messes with your natural chemicals." He said that he's really unhappy and has been so for years and maybe he should see a therapist. He said that he felt he couldn't be himself around me but that his unhappiness wasn't because of me and he just doesn't want a relationship right now. He said that we can hang out once in a while (but he unadded me on snap so I feel like he doesn't want to see me). He said this is the hardest thing he's ever had to do and that he still loves me and he cried while saying it (which he doesn't do) so I know he was being genuine. I miss him so much. I'm worried that he's not going to get help and will remain unhappy. I feel terrible for not noticing how much he was struggling. I've written him a letter saying that I want to be his friend and for him to be in my life even if it is as a friend. I said I would wait for him but that there's no pressure because I know he's not ready for a relationship right now and I want to respect that. Perhaps as friends we could improve our relationship an he could feel like he could be himself around me. I said I wanted to be there for him and help him through this bump. I am so crazy in love with him and not a second goes by he's not on my mind. I planned on sending the letter two weeks after the breakup. Maybe that will be enough time to see the results of his actions and he'll have time to figure out his feelings. I feel he might be self sabotaging the relationship and/or pushing me away cause he doesn't want to hurt me. Should I be the one to reach out? I feel he may be too scared to or may think I am better off.

I miss him like crazy and everything reminds me of him. We were in love. We never fought and it came so suddenly.

I just want to know, is that too early to reach out? Has anyone else been in this situation? I just need advice.