Welcome to my forum.
Let me be one of the first to say, "No, it isn't the fault of polyamory." There are all kinds of reasons why a poly relationship can go south, and poly itself isn't necessarily the culprit.
I'm glad you could join us. Whenever you feel up to telling your story, do feel free to do so, but don't be rushed or anything. You're still in the recovery process, I think.
You might like our Life stories and blogs board
, both for reading and for posting (when the time comes).
I hope this site will be helpful to you. (I've found it helpful.)