But I'm hurting so much and I'm in an open marriage, and I can't keep allowing her to walk on me while carrying on her affair. I really did come to the conclusion that I needed to do this to establish an important boundary. I will not be in an open marriage. There would be no way for us to fix this if she continued talking to the OM for an hour each day and probably dozens more texts/emails.
Have I gone too far? Did I just seal my fate to soon be divorced and split up my family? What in the world should I do now?
Well that depends if the first part of the above really WAS a core boundary of personal integrity with you, or if it wasn't (and was just a tactic to get her back). Because if you really ARE serious about not being able to live in an open marriage, then you really had nothing to lose by laying out the boundary -- it was something you couldn't have abided anyway.
Your wife is addicted, and affairs ARE highly addicting. Unless and until she cuts off all contact with this other man, she's going to remain blocked to you emotionally (and therefore, sexually).