Her concern is that after a year or 2 back together that I would just revert to old ways once "I got her back" I just told her I understand why she would feel that way, but that I was working on becoming a better man and father regardless of what happens with us.
My W said something similar, but I pointed out to her that I could never just put the marriage on autopilot again because now I know how dangerous that is. I never knew before. I told her I would be committed to working on the M constantly with her, because there's nothing to stop her from walking out the door again, she's already done it once!
Not that it did any good, we're still separated. But I thought it was a good response, LOL!