Been there, done that.
Once you begin to think about breaking up, most likely you will, sooner or later. Same thing happened to me, long d relationship through school and now half way across the world. We dated for 6 years, fought all the time, she's always being jealous, etc, etc. Finally broke up (very tough for the first few months) and now I've wonder why I didn't break up sooner. I got to enjoy my life, feel happier and met a great gal.
(Experience may vary)