How do I expose the affair

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Sorry so long and everyone 2x4’s welcome. I did expose A to H tonight. I told him what I knew, and of course, he tried to deny it at first. However, eventually he admitted it in not so many words. I won’t try to write out everything that was said, but I will give a brief summary:
Me: I told H that I seen it with my own eyes last night
H: he got mad and started telling me “f…k you”. He said that he had told me he was done, and so he didn’t consider it cheating.
Me: I stayed very calm and just told him these were his choices, not mine. I told him that I wasn’t the only one that knew about it or seen it (I didn’t tell him who else knew). I also said that OW’s H had a right to know as well.
H: He informed me that she hadn’t told her H, but that she was planning to leave him. He also then told me he was done, and was getting a lawyer
Me: I told him to do whatever he felt he needed to. Then I said I was done talking and walked away

That is a brief summary. However, I did stay very calm and yes, he did try to turn it around on me and start a fight. I will be letting the OW’s H know as soon as I can, however, whatever he decides to do with that info is up to him. I will not be using this against my H in any legal proceedings.

Not sure if DB’ing will work after this now. I will continue to do my 180’s, LRT, and GAL. Now I know these are for me and not him. That obsessed, crazy, despair feeling has left me since I confirmed the affair, and more weight has been lifted off my shoulders with me exposing it. I do believe at this point that the M is over, with what he said to me tonight. However, I do know that he was angry and I’m not sure if he meant everything he said. Nevertheless, honestly, his words no longer hurt me as they did before. He would make me feel so guilty and that all of this was my fault. I will be speaking to L tomorrow for legal advice.

I want to thank everyone for all the good advice today.