If you aren't dating anyone at the moment, just pretend you are.
I'd say the cutest thing she does is since she's originally from Honduras, she speaks Spanish really fast when she gets mad at me; I haven't the slightest idea what she's saying, but I think it's just absolutely adorable.
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She used to try to pay for our dates, the arguments we had were the cutest because you could tell she was trying to be polite. She recently has given up and I'm sad because of it.