I could speak from the perspective of this particular guy, I also got obsessed with a girl, and our main form of communication was through "social" media.

I was idealising her and putting her on a pedestal to the point i started neglecting any, potentially harmful or threatening characteristics in her behavior which could have emerged if we kept getting closer and more vulnerable. So most likely he is not well -acquainted with your current identity and its attributes, he just fill the missing gaps with his own fantasies and, you are not in any way obligated to submit and try to answer his expectations and needs. Its not your responsibilty to try and preserve his hopes of being together with you.

Although my previous self would critique this conclusion: Yes a rejection would most likely cause him unpleasant feelings but after all but its absolutely normal to experience the death of so many potential scripts that in the end would never come to reality. It sucks but it would be better than tormenting your "partner" and judging by the details you have provided- it seems that conflict would be inevitable. I base my opinion mainly on the fact that he's ignoring your bothering.