Most Helpful Guy
Clearly he can't be warm and communicative with women he's with; he has emotional blockages, obviously, or fixatons of various kinds. It would take a lot of therapy to get to the root of it all.
But when you're just an OBJECT to him, a stranger, not someone he's emotionally involved with, THEN he can verbalize all the fantasies he had about you. In fact, he probably didn't even HAVE such fantasies while you were together.
Reality wasn't satisfying tohim. You know, some guys hire hookers even though they have a healthy sex life, just so they can try out fantasies they couldn't with their loving partner.