I struggle with SI because... well I do it for a few reasons. When I feel like everything is out of control, i control it. When I am numb and dead inside, I do it to feel something. When I'm anxious, I do it and it lowers the anxiety.
That stuff is pretty much all caused by the things I have stuffed away in my life. Deaths, family issues, etc.

I think you can really only quit for yourself, not for anyone else. I have had times when I thought I was done, but then something comes up that throws me off and I do it again