It depends if the break up was agreed to by both parties or not. Either way though, if one person isn't happy in the relationship, then it won't work, and it's better to be alone than unhappy. Perhaps there was improper communication of needs, or the inability to act on the other person's communication of their needs. But to deal with the end result, the break up, just focus on building your life back up. Focus on becoming the person that either they want again, or that somebody else who's much better for you wants. Focus on yourself, your goals, your career, and your health. The thing is, sometimes break ups are the best thing that ever happened.. but you won't realize it until the better person comes along..