Oddly, in the online affair section MWD suggests that if you suspect, the confront. I would say this would be similar to an EA.

And basically, she says confront once and own your opinion and ask that it stop. If it does not stop or the AP denies, confront one more time...

and then try something different...

Again, not indicating that the LBS is to continue to badger the spouse, shame, blame, or coerce the sposue to end the A.

That's my take, anyhow.