Re: "I imagine that he has restricted any key words in comments that would make it appear anyone is siding with his ex." Guess again.
Re: "But the one thing that strikes me as strange about you is the way that you seem to think you’ve never done anything wrong and that you’re solely a victim in this." Correct: on this Melissa and I agree —indeed, all of the witnesses and participants agree. Neither Melissa nor anyone else is so wildly delusional as to think it was my fault that Melissa (e.g.) snuck away to masturbate on camera with another man in the middle of baking a cake on Christmas Eve —something I had no knowledge of, no control over, and so on.
Melissa knew the rules of the open relationship (a.k.a. polyamory) and she very intentionally broke them, while demanding that I adhere to those same rules strictly (the latter was something I was happy to do, BTW, as I thought the rules were for everyone's own good, e.g., not messaging people in secret, but being open and honest with each other, as a couple, about any flirtatious messages with other individuals/couples).
Re: "It’s like you’re incapable of acknowledging that you likely weren’t innocent in this relationship either." No, it's like you're making up a ludicrous fiction out of whole cloth that isn't compatible with any Melissa or I have ever said —and it's like you prefer your fiction to the reality that both Melissa and I have repeatedly attested to. This really is a situation in which I did nothing wrong. It happens. Get over it. I did.