I was the same, every time he would say he was stopping or cutting back or not drinking during the day I would be so happy that he was trying to make things better and so hopeful that NOW things would change. After a while and after realising that he never meant it...or more like he may have meant it but could never follow it through, I started believing in him less and less, I didn't carry around that hope and expectation because I knew deep down that I would only feel let down and upset again.
Part of detaching was letting go of those expectations and using him as a crutch, something to make me feel better or worse...I stayed busy educating myself about addiction and codependency and started taking less notice of him and his drinking, I found I didn't feel as bad when he failed to cut back because I wasn't holding my breath and crossing every finger that this would be the time he would succeed.
To be honest, even when he did succeed and was dry for 2 years, nothing changed much.