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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My girlfriend is great. I'll get home from work every night and she does this insanely cute thing where she doesn't exist [spoiler]Who needs girls when pizza can never reject you[/spoiler]