Your boundary speech sounds good - very clear. One tweak ~ give some thought as to whether or not you'd expose her to friends and family. Certainly, if OM is married, his W needs to know what you know. But threatening to tell friends and family might look like revenge as opposed to a consequence. The consequence for her A is exposing them to the OM's W b/c she has a right to know (plus that will bust the A pretty quick) and, if she doesn't comply with your no contact boundary, you will move her things OUT and divorce her. Telling friends and family seems to me like piling on and it might not reflect well on you long run. Not necessary for you to do it, anyway. Info like that GETS OUT on it's own.
Greek
Me45 H46 T25 M22 S21 & 19 D13 Separated and filed 8/08 Moved home 11/08