"Cool shoot me your number for romantic purposes."

At that point he might as well just say, "Ok, I need your number so I can have sex with you later." I think she would appreciate the honesty, honestly.

Then he makes it more awkward by saying, "If you are too nervous, I understand." How do women read? She's going to be thinking, "Should I be nervous? Why would he use that word?" He just cemented her aversion.