What his deal?

So there's this girl that my friends and me like fun of. She overweight so we call her fatty mcpatty (she eats McDonald's all the time).

My boyfriend (I haven't met his family yet) and me hanging out at the mall. And I saw her and I'm like there's Fatty McPatty (her real name is Patty). He give me a strange look and that's my sister. He dumped me on the spot. What his deal?
What his deal?
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