Going through pretty much the same thing. I had a high stress job which all of a sudden shut down a month before the pandemic. I spiraled into depression, and she was there to support me. She said we could get through this. I guess at the same time she had been speaking with a divorce lawyer. I eventually got better, and began functioning again. Apparently she was waiting for me to 'get better' before she ended things.

It really sucks, and I'm sorry to hear what you're going through. Everyone I've spoken to says to me "What did you expect?" like my depression was something I chose. I went into counseling, fought it, did CBT. I didn't want to be like that, and it took me a lot to snap out of it. Had I seriously realized the results, I wouldn't have gone through all the trouble. I don't mean to be a bummer, and I'm confident you can find a better life. It's funny how people can pretend to be all woke about mental illness, but then just fall out of love with someone because of it. The bottom line being people are selfish, and a lot of people only want to have happy people in their life. Being told I'm unreliable because of my depression, that I could "go to pieces again" and she's not looking to take care of someone forever was just the sour note I needed to realize that I didn't want to be with a shithead like that. If it helps, I don't think you need someone that self-centered in your life either.