This guy had the most hilarious possible reaction to catching his ex red-handed.
My slutty ex, in MY bed, in MY apartment. I Didn’t say anything for a good 5-10 seconds, just let them stare at me awkwardly. Then I said “all right, three way.” and started to strip. Never have I seen a dude get dressed and disappear so fast. She followed him shortly after once I had my apartment key back in my possession. Haven’t seen/heard from her since.