At the moment I am not sure that OW has completely gone. She appears to be lurking on the periphery!
All the more reason to go on AS IF he's not in your life...all the while just waiting and watching...as long as OW is anywhere in the vicinity, there's no chance of the two of you trying to come back together.
IF he falls into the trap of OW again...everything, (the whole OW Withdrawal phase) starts BACK over when he makes the attempt to come forward once again after breaking it off with OW AGAIN, no matter if it is the SAME OW or a different one.
It would be like watching the scene of a movie playing over and over again several times or forever.
And though I would be friendly and speak to him...I don't think I would trust him for now for quite awhile, even after OW exits the picture completely, and you WILL know when she's gone.
Sounds like he's pursuing you, but be careful of becoming a "safety net" and allowing the cycle of going back and forth to start up. You don't need that.
I hope this helps.
Remember, as each person is different, every MLC/Transition is different..what works for one may not work for another. Most of the time it is trial and error for ALL involved.