His going to 1 meeting and everything is fine, him actually spending time with his child and your family for 1 day and not being drunk..........is not the lifeboat you should jump into right now.
Now you don't have the money for a place of your own, now you don't want the support (possibly moving into your parents short term) and are putting yourself right back into the stuck position.
The other day you were so sure on what you needed to do now you are finding excuses not to.
Is it because he threw a few crumbs towards recovery your way, has those few incidents brought your HOPE level up again?