Not unless your friend knows something that you don't about the law. If its a no fault state, I would doubt there are any consequences for obvious infidelity. If the law doesn't allow it, judges can't penalize someone financially for being a douche.
The bigger issue is how the comment made you feel. I know exactly how it goes. Every time I hear something shitty about their life, I smile. By the same token, it will hit me if I find out something went well for them.
We both have to make a choice to try and not care. It's a bitch, I know. But, it has stalled my healing and it will stall yours.
The main thing to remember, I suppose, is that these leopards don't change their spots. We didn't turn them into lying, cheating bastards. They came out of the box that way, so no matter who is in their lives, that's what they will always be. We have tok believe that. We have to find our anger again, hold our heads high and declare that they are non-mother-fucking factors.