Caught Cheating, Then Laughed at Her Pain

AITA for walking out after catching my girlfriend cheating and then laughing when the guy ghosted

her? I (26M) came home early from a work trip to surprise my girlfriend Jenna

(25F). Instead, I walked into our apartment and immediately knew something was

wrong because it smelled like Axe body spray and panic. I heard giggling from the bedroom—already

suspicious because Jenna does not giggle. She either cackles like a dolphin or stays silent like

a WiFi router with no signal. I opened the door and found her in bed with Kyle.

For context, Kyle is her coworker’s cousin’s neighbor’s roommate—basically a human chain link.

He’s shaped like a pool noodle, calls himself a DJ, and exclusively