as a bizarre follow-up, while i was at a friend's birthday party tonight, the XABF in question proceeded to text me out of the blue FIVE TIMES asking to see me.
if this had happened two months ago i might have considered leaving the party early in order to see him.
instead i followed the plan described in my initial post, and told him that i couldn't see him right now! and i feel really proud of myself for having done that.