You can break up in theory, or you can break up in reality. Only one of them is an actual break-up. People who break up in theory decide they’re no longer together, then proceed to sleep together, call each other every day, and know each other’s daily plans.
People who break up in reality end the relationship and all elements of the behavior associated with the relationship for an undetermined period of time. Note: you can technically be “broken up while he’s in business school,” but not if you’re together every time he’s home for vacation.
If you’re unclear as to which of the above is an actual break-up, please don’t date my friends.