Coworker keeps teasing me, why?

And only me. It doesn't matter what I do or say. I'm shy and bashful and always end up blushing. He galways suggests going to get coffee with me and asks me a lot about myself. We'll be alone on phone conferences together and he will do anything to make me laugh , giggle, and smile. It gets so bad that I end up covering my face! It's difficult brcause we're not allowed to flirt where we work. It doesn't help the fact that he's cute! He teased me so much that I got super shy and blushed.he told me that he liked that ...that it was...then he stopped himself because others were looking and listening and said it was *charming*...what's going on? What do I do since we're not allowed to flirt (at least I think that's what it is)?
Coworker keeps teasing me, why?
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