Can a relationship of 2 years that has taken 2 breaks and has recently broken up but gotten back together 2 weeks later really last, and why do couples do this?

Guys friend and girlfriend have dated for two years. They have take two breaks and recently broke up but got back together 2 weeks later. She is the one always asking for breaks. Can relationships like this really last for good, and why do couples do this. They are 20 and18 yrs old. he is in college and she is a homeschooled girl in his hometown 2 hrs away; she is his first love but third girlfriend.