Having experienced quite a few situations of broken shidduchim, boys’ side and girls’ side, I must comment on the generalizations that are typical to these discussions. Boys and girls are very different, in their values, their tendencies, their middos, and all of this is dwarfed by the individual differences between any two people.
The factors in every situation are unique. And many of the issues may well be beyond human grasp. Imagine that someone can share a rational reason for wanting in or out of a shidduch. We can converse about this, agree, disagree, and our thoughts and positions on this may actually matter. However, if the reasons that someone is attracted to or repelled by a prospective chosson or kallah emanate from the emotional side, all our discussions are a huge waste of time. People differ on how much emotional connection they want to feel to enter into a shidduch or to withdraw from it. You cannot legislate emotion.
We have all heard prescriptions from various people, sometimes professionals, sometimes roshei yeshiva, sometimes just friends and acquaintances on how many dates someone needs to have before looking to conclude a shidduch. I frown on these bits of advice, as they generalize something with is specific and unique to each individual.