I agree....H needs to tell the OW to back off himself. My friends thought I should do the same thing. Pleade to OW as a woman and a mother and tell her to back off. The thing is, that is your H's job. He needs to keep the boundary there with OW on his own.
Me: 46 FWS: 36 Married and Divorced 4/07, Pregnant 7/07,False R 7/07 Baby Girl born 3/08 Kicked him out because OW: 7/08 5/10 He realized what he had and lost. Moved home! REMARRIED 3/14/11!!