tjcran, My MIL was the first person I told about my WW's EA. The reason I did that was because I was desperate as my WW was about to leave, and my MIL knew about the first EA with the same ex-boyfriend 17 years ago. She at first swore that she will never let WW get a D, and pushed her back together with me. But alas, blood is thicker than water, and in the end she secretly funded WW's divorce retainer.
In the end, I feel telling my MIL had no impact on the D. It probably stalled it for three months. But I am glad that she knows the truth, it gave me a sense of vindication. I do feel betrayed by my MIL as she went back on her word, but she apologized to me and said WW is her only daughter so she had to relent. She realizes it is all WW's fault, she told me whatever complaints WW told her about me was no comparison for her cheating on me.
Me-LBH, 48 Spouse-WW, 48 Married for 19 years Son, 12 BD #1 - November 1998 (EA 7 months after wedding) BD #2 - November 2015 (same XBF EA) WW filed D February 2016 WW moved out April 2016