Changing in a week is not possible.
Let’s say if it was a bad sleeping schedule due to work time, and he tries to quit or change jobs or whatever Might be plausible
But change his problems/attitude in a week Is a bit too far of a stretch The desperation is strong with this one. You already broke up Now off you go to block him as well. Steel your heart, lest you want to be dragged down (again perhaps) into his manipulation