I believe the golden rule of DB is do more of what works and less of what doesn't. Although, in our minds, the right thing for the S to do should be to drop the OP. However, if making this demand does not work to reach your goals, then it must be abandonded to find out what does work. I believe what does work to reach the goal of ridding the OP is to find out what will attract S back to us and our M.
