I was with my ex boyfriend for around two and a half years and we had a few breaks. We had our fair share of problems because it was long distance, I found it hard coping with a boyfriend in another country and he found it difficult to actually make an effort. On top of the stresses of a long distance relationship, I was going through a lot with leaving school, finding college's, exams, exam results, family problems, self harm problems... it just became too much at some point and I needed a break to sort myself out. Sorting myself out was so much more important than some long distance relationship, I took some time to myself and eventually went back to him. I just needed the space to sort things out on my own, and I went back into the relationship a happier person because I dealt with my problems.
Everyone has problems and everyone needs their own space. Relationships can be stressful, even the best relationships can add a little bit of stress if you are having a tough time. It's nice to get a bit of space to clear your head, deal with your own problems and have time on your own. Breaks aren't always a bad thing, sometimes that is exactly what a relationship needs.