owen really really tough one

married or not - make it clear you are very devotedly married.

any 'off target comments' re-focus his mind:
'what do you think about this report'
'sorry i don't like to talk about my personal life at work'
'how is your wife?'

What support do you have from GM?
Could he reasign some of the contact with the client to someone else?

Does he come into your office? Photos of hubby - children.
Flowers from hubby on desk.

you really are between a rock and a hard place here