Eight months pregnant, I practically pushed him out the door for a guys' weekend. Then his best friend called, and the line went dead the second I told him where my husband was.

I knew for three weeks before the dinner party. I poured the wine. I plated the lamb. I let everyone get comfortable. Then I set my fork down.

When my marriage cracked, I expected to lean on my oldest friend. I never imagined she was the one holding the knife the whole time.

She wanted him to be the soft place she landed when her relationship finally collapsed. He had other plans for the night she pushed too far.

A late-night notification from a smart speaker app pinged her phone two hundred miles from home. She only opened it out of habit. Then she pressed play.

Her selfie was innocent—until I saw my own bathroom behind her.