The thing is, teh OW and your H very likley WERE talking about your marriage and his feeligns about it early on, this is very often how affairs start.
At some point, they started talking more about each other about themselves, and less and less about thier respective marriages...
At THIS point in their affair, she is NOT likley giving him ANY advice about his marriage at ALL other than to leave...
This means your H has no place to go for that, other than this IC. I can't confirm the IC's credentials without a website or something to help see if this person is going to be able to help you that much... selecting a good IC is VERY important. And right now, your H NEEDS that, he can't rely on OW for good advice anymore (assuming she ever gave him anything other than sympathy... OW usually just start as sympathizers until the EA kicks in), I am just wondering where he's giong to go at a difficult time, his IC as well is only going to talk to him during session, not when hs mood to talk is there. It would be great if your friend reconsidered...