Has anyone ever had to break off a relationship....?!

Has anyone ever had to break off a relationship....?

due to problems with clinical depression?? And if so, do you think it would be difficult for them to continue contact with the person they broke up with, even though they are trying to help?? My ex suffered from depression due to his ex cheating on him, and broke it off with me 5 months ago because his depression came back and he could not handle being in a relationship at that time. I had hoped we would keep in touch, but obviously it's very hard to get through to him and get him to talk to me. I've told him I'm here for him if he ever needs anything, and I've backed off to give him his space. I keep in contact every few weeks through email just to check up on him. Sometimes he responds, and sometimes doesn't. Last time he did he said he was doing okay, not the best but just managing to get by. He also said things were still uneasy but were working their way out. I know I can't do much to help him, but I want to better understand his indifference towards me. Any input?

1 week ago
I also do not know if he is getting help. He is most likely not taking medication because he did that before and it made him suicidal. He told me he would never go back to taking those meds...

No, no, no. You cannot continue contact with your ex. You cannot help him. You have to let him go. It's making things worse. Your relationship is OVER. You need to get over it now and focus on you. His depression is sucking you in. Even without mental health issues, you don't keep in touch with your ex. You don't email, call....nothing. It's obvious he doesn't want to communicate with you. It's been 5 months!
You need counseling, too.

Let go.