Most Helpful Guy
he either still thinks of you or he never put any real weight into the names.
Most Helpful Girl
It seems with the writing on the wall and all, he has Moved on, has found someone to replace your face, and with calling 'Pet names,' he hasn't much Pet Peeves with her but finds that he has a chemistry and comfort that he has found with The... Newbie.
There could Your Qualities that he finds in the Present Partner and some of her Own that he has found with her as well.
Good luck. xx