I think the lack of trust is a huge issue in any M, regardless of the actual cause of the mistrust (cheating, lying, BD, etc) I get not being completely vulnerable because of it. I think that's why some M's fail even after the couple R's after an affair, because the offended party just can't trust again. I don't have an answer to this, but I'm constantly looking because I have several areas of mistrust myself, so I'll let you know if I come up with something.
