Which of these is a final demand of terms, the rejections of which will result in a breakdown in relation?

RSVP78, They are more frequent than you think, at least around here they do. For example: ask anyone who has had an intervention, or had a friend couple go through a nasty divorce or break up & one of them is inevitably going to ask you to choose or else. My personal philosophy is... "You make me choose, you lose."