Re: What do you make of this situation and how would you deal with it?
Being that it was a recent split, I wonder if your friend is going through a lot of stress and is perhaps a bit paranoid, or wanting to lash out and needs a target.
I don't think there's much to do besides reach out to your friend and let him know that his "source" is incorrect, you haven't so much as spoken to his ex-wife, and you wouldn't do something as low as pursue his ex behind his back anyway. If you are able, you can offer to be a listening ear if he needs someone to talk to, but only if he truly trusts you and will drop the accusations. After that, the ball is in his court.
__________________
On the road of experience, join in the living day. If there's an answer it's just that it's just that way.
When you're looking for space and to find out who you are...When you're looking to try and reach the stars.
It's a sweet, sweet, sweet dream; sometimes I'm almost there
Sometimes I fly like an eagle, sometimes I'm deep in despair.