From the story there, I agree. Even if she didn't bring you into this one, how long until she does when there's another conflict? The two of you had different ways of resolving issues and she thought that was enough to end the relationship. I can't imagine it would've gone far. Sorry.I think you may be better off.
But ....
Ok there is no but to that. I need to run away. Now.
I agree with all of the above. It sounds like she's digging up drama with this other guy, and dragging you into it to make it an even bigger drama. NO WAY should you even get involved in what is going on with her and this other guy. Leave it up to them to hash it out. There's something weird going on there that is better left alone.