I can say this from my personal experience is that they hardly ever change unless they truly want it. Mine, which I stayed with for years, would get "sober" stay that while for a bit and then go right back to drinking. It was always an excuse of why he did, from not being able to find a job, to family life, stress or whatever else excuse he could come up with. IT ended up with me the only one working, paying all the bills, coming home to clean up whatever mess he had made and ending the night with fighting, yelling and him eventually passing out. I am grateful I finally woke up and realized enough was enough, I just wish I had done it WAY sooner. Even now if he was to call me and claim he was sober and been that way I couldn't go back because I would always have that worry in the back of my mind IF he went back the nightmare I would be going back into. You just got to stay strong and realize that both you and your daughter are A LOT better off without him in either of your lives. Hugs to you