Maybe Starsky will help refresh my memory. There's a term that we use to have around here, gas lighting or maybe it was "tag".
A WAW will use sex to see if she still has that connection to him or over him, but it's not b/c she desires him. All his well laid work could be shot down that first time he weakens to her flirtations or sexual advances. Once she sees that she can still get through that door, then she immediately looses interest and leaves him standing in the cold.
Yes, I believe he should have denied her sex the first time they met since she left the home. This woman needs to realize she gave him up and that she can't dart in & out of his life/heart whenever she decides. If this is the case here, it's cruel b/c it's just enough to keep him torn up and thinking she's ready to R.
Nothing new, really. For centuries, women have used sex as a control tool to get what they want from men. Unfortunately, this is just one example.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!