A break up, but not truly a break up, i.e. both parties still feel an obligation towards one another, engage in frequent phone calls and "meetings", and feel guilty about beginning to date other people. It is a psychological way of coping with the difficulties of a relationship by both parties distancing themselves from the relationship itself and allowing one another breathing room.
Person 1: Hey, I just saw Leland and Lisa together last night. Didn't they break up because of school commitments?
When a couple breaks up but then quickly gets back together. Sometimes one or both of the partners "fake up" with the intention of getting back together. Other times one partner breaks up with the other impulsively and realizes it was a mistake, causing him/her to quickly make amends and get back together. Thus, the fake up can be intentional or unplanned.