Yeah, that sucks. I’ve had the same thing happen with one of my (former) gay friends; he just wouldn’t drop it. It was really uncomfortable, and I eventually dropped him as a friend because he refused to respect my boundaries.

I mean, yeah, I get it; you don’t really have a choice over how you feel. Some people experience limerance, and it’s not a choice, but how they act is. I’ve had the displeasure of experiencing limerance a number of times, and each time I’ve found that it was more productive to cease contact with the person than to, well, do exactly what your online friend is doing.