All I can say is, even though it basically goes against my own story, is DO NOT rely on that feeling that you are "not done." It is not accurate nor reliable, especially if there's been a previous break-up. It can AND WILL set you back and you might end up waiting for her to come around. My story is one where we did get back together and things ended up working out, but typically, couples don't (and shouldn't) get back together if there's more than one break-up.
I told myself it would be fine if he didn't come back because I had things I wanted to take care of in my own life. I took the position of, "whatever happens, happens" and just took care of me. You mentioned that you have depression; if so, are you getting help for it? What are you doing to make your life better? Speaking honestly as someone who knows what it's like to be with someone who has depression, it can be exhausting and disheartening seeing your partner go through it. I did all I felt I could do at the time before I withdrew from him myself.
Focus on YOU now. Do what makes YOU happy and get help if you aren't already (it's the best thing you can do for your depression). Go NC - delete her number, block her on Facebook and any social media, etc. Just live YOUR life. By doing this, you will heal - just give it time. You will have setbacks; acknowledge them but don't wallow. Move past them. Just keep going. If she comes back, she comes back; if she doesn't, she doesn't. Keep going forward in your life no matter the outcome.