When a girl calls a guy "rare", what does that mean?

Anonymous
I invited (day 1) this beautiful girl from my English class out on a date (day 2) after hearing that the day 1 is supposedly her birthday. We went out early evening on a coffee shop famous for its sweets. There we talked a lot and had a good time. Then I coaxed her into taking a bus ride home since its longer and would give me more chance to talk with her. On the ride home, I asked her what she was thinking of during a silent time. She was surprised and asked me if I can tell if she's thinking about something or not despite the blank face. I said yes and she said she won't tell me with a smile. After 5 mins she said out of nowhere "you're rare". What does that mean? Is that good or bad? Does she like me or not?
When a girl calls a guy "rare", what does that mean?
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