I**f after you made your feelings known, he has stopped with the abusive behavior, I would accept that at face value. Progress not perfection. As long as there is steady progress, I would celebrate that and work with it. ** The disruption and trauma of divorce is real.
Being an aspie, it might help if you journal and track progress, so that you can see the big picture. Expect a bad day here and there but if he is trying, maybe he stopped and realized what he was doing. Is this the first time you have seen him “rally” to the point he is now doing? If so give him a little time to grow. Don’t go back to being abused, but don’t end things if he is now making a supreme effort.
As far as temptation goes, many suffer from that. Ask Our Lady for help. She will always. Not asking for help is a clear indicator that we don’t want any help, that we are choosing to fall. If we are sincere about getting help we will get it.