Girl Doesn't Say Thank You After a Date?

I took a girl out on a date. I bought her coffee (not too big of a deal), but at the end of the date, she didn't even say thank you for it (or while I paid for it). She did give me a nice hug when we left and was sweet to during the date.

Should that be a deal breaker that she didn't say "thank you"? I don't want to sweat over that, but... It just seems like you should say it...
Girl Doesn't Say Thank You After a Date?
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