Walt felt terribly unqualified to deal with this problem, but there didn't seem to be anyone else around to pick up the slack, even when she started screeching about informing the rest of the school.  He took a deep breath and tried again.  "Brigitte.  If it's not such a big deal, you ought to be able to find something else to do.  Another way to deal.  Just stop."

“Cliff doesn’t need to know. Eph doesn’t need to know. And you don’t need to know. If I had wanted you to know, I would have told you.”

To that he said nothing at all, because they both knew Eph was the one person Walt didn't try to keep secrets from, and that he was highly unlikely to start now.

"Just..don't do it again, Brigitte. Please."