When do you give up?

I'm 42 aparated from my wife 2 weeks ago. She suffers depression and admits it but refuses to seek help. She googles help but does nothing. She has basically lay in bed for 12-18months doing nothing while I worked and worried. She says she has no feelings for me anymore and that's it she's moving in. We still are living together as we have a 7 yr old boy with autism and she has just started a new job working five nights a week. I obviously need to be here to look after our boy. I lost my job less than a week after she called for the separation. She says the depression has nothing to do with her feelings. I can't see how we had a chance with her condition consuming her, I feel like I'm the easy one to blame and ditch rather than seeking help. I promised her I'd never quit on her and always support her as she has been mistreated by every past person in her life. I told her I want to be the one constant in her life that never gave up on her and always stood there taking the bad treatment because I love her. I can see other things where the relationship was suffering but I still believe she's made her choice to quit on us and not get help. I know when she worked for about 3 months she started to come back to me but then lost that job and went straight back to bed. I was hoping with this new job she would come back again but she didn't wait she just quit. I don't want to quit but we are in a small town and the work prospects for me would only be enough if we were together. I don't want to lose sour family and I'm willing to do whatever it takes if there's a chance. But I need a job and I need to be prepared to look after me also moving forward, I don't want to be strung along for 6 months just because it suits her job! I'm kind of stuck in a catch 22. If I move she might realise she wants me still but if I move she may not be able to keep her job and that would be seen as my fault and ruin any hope I have. Lost broke confused lonely sad