Live some life together, out of the bedroom, and see how the relationship part of the partnership goes. It will become obvious if there are lifestyle or emotional differences. And when you keep the raging hormones at bay you can see this person without the rose-colored glasses.
Even before the relationship began to physically disintegrate, we were feeling a bit disconnected. How did we lose what was once so hot and pure? How did the dream die, even as we were trying to be good partners and good stewards of our lover's heart?