Guys of GAG, what hat would you do if you took your girlfriend out for a birthday dinner, and she invited her friends and wanted you to pay for them?

The title explains it. Thankfully this has never happened to me.. But what would you do if you took your girlfriend out for birthday dinner, and she, without telling you, invited 20 of her friends, and expected you to pay for them. The final bill for the meal was 4500 dollars.

If it were me, I'd pay for my meal, and leave her with Check remainder of the check, and go home. At home I'd change my locks, move her stuff out, and block her number on everything.
Guys of GAG, what hat would you do if you took your girlfriend out for a birthday dinner, and she invited her friends and wanted you to pay for them?
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