Your cute girlfriend
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She liked to tease you and see your angry face. And when you do get angry, she would give you a big satisfied smile like she has won, much like an attention-seeking cat, and you kind of like it.
A few months ago, you couldn't resist to confess your love to her. She laughed it off, but asked you to go out with her the next day nonetheless. She never confirmed your relationship, but she would hold your hands, make you bento, and do all the girlfriend things with you.
It feels weird, but it is just the way she likes it.