I know how you feel. The moving on part has been the hardest part for me to get over.
I've been married 18 yrs. I told my AH I wanted a divorce if he didn't go get help for his drinking. He had no qulams and chose drinking.
He's also never shown any sign of love, affection or wanting me back since that day (a month ago). Not that I want him back, but it would be good for the bruised ego to know he still cared.
My therapist said A's often move on quickly. They need someone to take care of them. Don't take it personally.