AITA? He Switched My Dress With His Ex’s At Dinner — And I Had To Wear It

I’m 28 and have been seeing Alex for three months. He asked me to meet him for a “fancy” dinner and insisted I wear the red dress he’d complimented on me. When I arrived I realized the dress he’d given me to change into wasn’t mine—there were lipstick smudges down the side and a receipt with a different name. I laughed it off at first, until the hostess led someone in who froze when she saw me. It was his ex, in the exact same dress, smiling like she’d planned this.

I confronted Alex at the table; he shrugged and said, “We’re all friends.” The ex leaned in and started pointing out things only someone who’d lived with him would know—details I thought were mine alone. The restaurant got quiet; people stared. I grabbed my purse, ready to leave, but she reached into her bag, slid a folded photo across the table and in a calm voice said three words that made my fingers go numb. She leaned forward and whispered, “He’s…”