The exposure is a timing thing, and a big part of that is you assessing impact.
That is SO important.
I don't know how much Retro will help if your H's heart is elsewhere, but it might just bring him round. Some people have gone even though the A was still ongoing.
You could try going there and then exposing afterwards if Retro doesn't seem to bring your H back to you. My big question though is how can you be honest with one another if your H is still involved with OP when you go? Bit of a catch 22.
However Retro could give you the tools to communicate better and also give you the tools to know how to expose in an effective way as I believe the weekend is about ways of communicating amongst other things.
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength