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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Me and my ex still hang out and what not, we dated for 2 years snd throughout that whole time, it may not be cute but it always made me laugh, she'd say some of the most random things when she falls asleep lol.