I do think that it's the majority of the time (hence, my use of the word "often," instead of "sometimes"). But it was either Glass or Harley who did groundbreaking work and were, themselves, astonished to find that about 20-25% (if memory serves me correctly) of infidelity came from otherwise HAPPY marriages (and "happy" being defined as BOTH spouses reporting that it was, indeed, a happy and good marriage).
It would be a mistake for a LBS to not look at their own role in the negative contributions to any marital dysfunction.
It would also be a mistake, I believe, for a LBS to always assume that they are in need of fixing, otherwise their spouse wouldn't have cheated on them. Sometimes it really is just lust.
