I think that you will probably feel much better in yourself for letting all that frustration and anger out. I did. It's just that I left it all in the C office rather than spray paint his car and send the very caustic e-mail I had written.
Your H will probably forget it like the earlier convo re RT that he can't remember. As for her - she doesn't deserve your thoughts or attention. Forget it.
Move on, as the amazing women you are - and that any man would be stupid to leave...