I need help with my ex

Okay so, My ex and I were crazy in love two days ago (we have been fighting a lot) He doesn't realty treat me as well as he did. We had a cruise scheduled and two days before it, He calls me and says"He doesn't feel the same" I didn't sleep at all not one bit, last night. I want him more then anyone and he said "I really can't see us together in college anyway" cause we'll be two hours apart. How could I get over him or get him back? How could I ?