Miss, I understand your feeling.
Some guys are really slow on understanding lady's Yes=NO, NO=yes.
You should be confident with yourself, and no need to hide your feeling.
it is 2007 la, just say this to him ... "TAO YAN DE, 叫 ni 唔駛送我上樓, ni 真係無送 ... hao ben de ni " with a flirting tone ...
see how he reacts la ... you can tell from his eyes right away ... if he like you or not...
make sure your tone is flirty :), good luck
hope all help