Kissak....time, time, time, patience, patience, patience...
You said you don't want to hear about how much he misses OW and you know that is what he is struggling with right now...so why let him know he can talk to you???...
I think the comment about dating was to bait you...to find out if your still "waiting" for him or if you are truly moving on and out of his life...
So just be patient...give him time...and let him work this out on his own and with his therapist...that way you don't have to hear the stuff that you really don't want to hear...