Blair Waldorf when...

your ex starts flirting with you.

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"Um, excuse you?" Blair scoffed glaring up at y/n's ex who had just started flirting with her right in front of Blair.

"What?" The girl asked glaring right back at her.

"She's not interested. Back off." Blair demanded.

"She was interested last year." The girl smirked smugly.

"Well she didn't know me last year." Blair said. "y/n doesn't settle for less anymore." She smiled.