It's understandable to call out a cheater.
Bernie sees Piper's husband at the mall holding hands with another woman.
Bernie wants to walk past the couple.
As Bernie walks by the couple she asks Piper's husband how his wife is.
Bernie turns her head and pretends not to see the couple as she continues down the hallway.
The other woman breaks it off with Piper's husband and can find someone worthwhile.
The other woman is unaware of the relationship with Piper and continues the illicit affair.