Most Helpful Guy
No it's not a good idea to stay in contact with him
you're trying to forget and move on with life but
i think most of what he's doing is just to throw
digs to you and to get you going.
Most Helpful Girl
He is Not totally over You, @xtroublex, and with a newbie on one end of his arm, You are Still... Hooked at the hip on another Friend end.
He may find you as one, in his own willy way, trying to have his sweet cake and Eat it Two right now. He probably figures with you in his back pocket, that if she and he break it off tomorrow, he can come crying on his shoulder and you won't have a sour ball about it.
It's up to you how You feel about this little sticky situation. If you find it's Not your cup of tea, tell him you are Not the one who should be getting the short end of the stick and go blow, Joe.
However, if you are fine with it, then stay in the Triangle Threesome, where you are way at the tip, looking down, from side to side, at Her and him with no whim.
Good luck. xx