That all sounds familiar tbh. I don't know why family can be that way, like what's the real, under the surface psychology with that behaviour? Are they incapable of empathy, are they narcissistic are they self obsessed? I never figured it out and stopped looking to them for help and comfort because it hurts too much when they don't care. I've found journalling or emailing a suicide/depression service helpful when it's too much because turning to family is no longer an option.

I'm really sorry your gf ghosted you. I hope the suffering eases up and you find some relief so that you can heal from the hurt. When you're already depressed you need to be super kind and gentle with yourself.