My X read on a site I was posting on for infidelity help, before i found SI. He posed as an innocent bystander and gave me advice. Basically he told me I was full of shit, and that I was wrong and needed to take my remorseful WS back...... Basically gave me, a hurting fragile BS a huge 2X4
Problem is he is stupid as a box of rocks, and had just a wee bit too much info in his several posts to me. Since he thinks he is better than everyone, he never suspected he gave himself away. Only took a bit of sleuthing for me to prove it was him (and no I never told him I knew) That was the beginning of me seeing, really SEEING, how screwed-up he is/was.
Manipulative, selfish, broken people do crap like that. Just saying.