I had been with my partner for 4 years. After about 3 years into the relationship we began to stop talking to each other about our everyday comings and goings. I really had no interest in what was going on with his life and he didn't care about mine.
This slow degenerated into all fun activities were conducted without each other. We talked about how we were no longer interested in the other person and finally after about a year of this we broke up.