No. No grand pronouncements (especially legal ones -- never tip your hand legally). Whatever you decide you need to do, just DO. She's a big girl and will understand that it's a consequence of her continuing to violate your core boundary.
Look, no one's telling you to do this. But it has to at least be on the table, and you SHOULD know what your legal rights (and responsibilities) are anyway. Get more info, and be prepared for any eventuality. Only YOU can decide when you can no longer remain in the marriage -- that's not for any of us to decide. We can only point out to you some of the pitfalls of "limbo" that you may not be seeing clearly right now.
I ultimately had to file (hired an atty, hired a mediator). I also saved my marriage.
