She needs to tell him. It's not your place to get involved in their relationship.
He is a big boy and can talk to his own mother. Let him live his life. You need to step back and stop trying to manipulate situations in hopes that it will bring him home.
Trust me, it will bite you in the butt. You will be seen as sticking your nose where it doesn't belong, and you are.
Just pray that God will help your H's relationship with his mother to heal and let HIM do the work.
Stay out of it.
period.
BFM
There is only one person who could ever make you happy, and that person is you. David Burns, Intimate Connections
