If these people she is politicking with were at your wedding, i would use that angle...
Make it clear you are still in the game and bring the problem HOME to these people.. ask tehm
Joe, if you came to me and introduced me to a woman you were seeing and your wife mary was miserable, I would REFUSE to have anything to do with that... and I would invite both YOU and mary to go to family therapy... THAT is what I would do for yout wo because I was at YORU wedding.. and I want to respect not just the two of you, but your commitment as well, even if one of you decides to stray from that commitment... My wife isnt' pursuing happiness, she's chasing excitement... it will come to reality eventually... I would LIKE you to at LEAST respect my marriage in sofar as to NOT get involved with her Or OM ... this man does NOT respect a wedding ring, and he isnt' respecting HER... please at least support me that far... as I woudl do for you