Fuck how you tell him
then start to go out without him and find yourself a proper Adonis.
Meanwhile transform your man in a sissy
first if he wants to see your sexy underwear again he got to wear only panties.
Then be sure he continues shaving.
In order to improve his anal skills (and to prevent pain) ask him to wear a buttplug.
Tell him to do the laundry, the washing up everything since he is not worthy any sexual attention from you.
If he has been a good boy give him a handjob (but he has to clean it afterwards). If he has been a bad boy then fuck him in the ass and milk him (you will find how to do it on the internet). If he has been a very very good boy put on one of the favourite lingerie set and ask him to fuck you with a strapon (bigger than his dick).
Your slave is now a sissy. You have to please yourself so feel free to have sex with whoever you want.
Come back from work later and later.
Have some phone calls, be sure to look suspicious.
One night tell him you are sorry but he doesn't please you so you have looked elsewhere.
Humiliate him and go to sleep as if nothing had happened.