Why I should he moving so fast?

I'm a cashier and a customer from work added me on Facebook and we starting talking but he went from like 0 to 1000 like real fast within two days he went from I think your cute to I like you to how would you feel if I bought you flowers. I don't know everyone says he's a sweet guy but I don't know it makes me uncomfortable that someone can move that fast. I mean we haven't even met in person yet other than when he comes into the store. and he's so shy when he comes in that he doesn't say anything. Plus he always asks if I'm okay about everything he likes or does and I don't know it annoys me. How do I deal with this?
Why I should he moving so fast?
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