Romance means feelings of love while chemistry between two people means a powerful attraction -usually sexual. As to admirology I haved never heard this term and it is not in the dictionary. However, it seems to be related to the word admire - possibly it is intended to meav deep respect or admiration. Where did you come across the word?
I missed the fact that at least one of you is a native speaker. I'm not sure what your boyfriend meant as I have no idea what admirology is.
Out of interest I checked the Oxford Dictionary and it says that one of the meanings is - "colloquial sexual attraction"
However, don't worry about it as I said it doesn't mean ... just that the attraction is strong and mutual.
Hope I haven't caused you a problem with your bf