Advice about ending relationships

I’ve been friends with this guy for 7 years it evolved into a relationship but there was no official title. I was raped a couple months ago and have emotional problems in general. He’s one of those people that doesn’t “believe” in therapy and really not even depression. Which has always bothered me. In the beginning he was supportive when I was going through the worst of it but now it’s to the point where he’s tired of it and won’t deal with me at all. I don’t tell him much about how I feel anyways but when I do he talks like I choose to be depressed. So I’m at the point now where I have it set in my head I’m going to end it. I am terrified of breakups bc I know how bad it effected me in the past. I’m going to try to word it in a way that’s less likely to get an angry or defensive response. For the first time in my life I want to be single and I probably will for awhile. Anyone with depression have advice or things they did to cope with the grief of a breakup? I’m trying to prepare myself before I do it so that hopefully it won’t be as bad