You say the 'other woman' 'seems to have a lot of emotional problems', but you ferreted out the chat from his cell phone, started a blog just so you could post it all and did so, probably hoping he or she would see it. Then you posted on Mudcat, probably hoping he or she would see it.

You need to confront him and leave the rest of the world AND the vindictiveness out of it, although it's probably too late for the latter. It seems like you want the relationship with him to end, though, as you're already gathering allies in the war you plan. The 'rest of the world' gets annoyed when people invite them in to share the bad vibes... except perhaps Jerry Springer audiences.

If you can't talk to him about it without soliciting outside help, you've already lost and the relationship is probably history.