First we cant really tell you what your dosage should be because its different for all of us. We all are built different both on the inside and outside so you have to experiment to find the dosage that works well for you.
You do this by reading this post 
>>>>>>>>. How to Test and Report On Products UPDATED 12/01
Finding your sweet spot is explained at the bottom of the first post there.
Next I do feel from what you have told us he probably has a interest in you. He just may be shy or nervous just like you so he has trouble conversing sometimes. I would start with Ishine and IH to help give him a more comfortable close feeling. This should help him open up more, Then once you get that working layer in some instant sexiness to help peek his romantic interest.
Tisha