HELP: how to deal with my depressed ex

I amicably ended a 1.5 year relationship last week. We have tried to remain as we still like each other, but while my ex has made it clear he wants to get back together, I have ruled this out and made it emphatically clear. Today he tells me that he's seeing his GP tomorrow after his family confronted him about his recent behaviour, as he has struggled with depression before. He told me he's been crying himself to sleep and having dark thoughts, just like last time. I want to be supportive, but I also recognise he probably needs to be left alone to move on. He is precocious, albeit over-dependent, and his world/future seems to have crumbled around him. How should I proceed?

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