Do you have any evidence that he's cheating on you?
Exposure really should come with some solid evidence, you will have an uphill battle exposing to anyone if you just want them to accept your say so.
I never went to Retro. but they claim that it wont' help when an affair is taking place... you would need someone who went through the Retro. program to tell you if it would help you much right now.
The exposure is a timing thing, and a big part of that is you assessing impact.
If you expose NOW, instead of three weeks from now, in what way might the results be different?
I really don't recommend exposure until you have solid evidence you can share with the people you are exposing to. If you just want them to take your say-so your H is just going to reverse-expose to everyone and deny it -- AND he will tell everyone you are paranoid and controlling to boot.