You are jumping the gun and assuming she didn't try to address this. The fact is you can't force someone to say something they aren't ready to. She did ask him several times, in many ways.
FWIW, I did ask her last night about her experience with this type situation...it is within her realm of expertise. She's dealt with many couples who have cheated/been cheated on....or have had porn addictions. I feel comfortable with her helping us....that's what is most important IMPO.