So sorry to hear about what you're going through. I'm afraid that I don't have a cut and dry answer, but you mentioned having a DB coach? It sounds like there are some very serious decisions that you need to make, i.e. whether to contact a lawyer, whether to confront your H, whether to discuss the R, to set boundaries etc. I would highly recommend having a call with a DB coach before making a decision like that. This isn't one of those acts like calling or sending a text that could be easily fixed if it does end up going wrong. My guess is that all of us on this board will have different pieces of advice, but the coach will be best able to look at your own unique situation and help you to figure out what would be most effective for you.
Definitely keep venting though and writing mock emails. The board has saved me from sending letters and emails that might have destroyed my already fragile situation several times...
ITH
Me:34 H:36 M:5 years T: 8 years Bomb: 07/17/08 I want to be separated for 6 months--I don't know what I want the outcome to be S 07/28/08-11/08/08 Living together ~7 months D Possibly busted?!?!!!