A quote from Dr. Laura (my bolds):
People don’t actually “grow apart” in relationships. They simply stop taking care of each other. They stop waking up and looking at their spouse with gratitude and awe. They stop finding ways to make that person happy that they are married to each other. They stop behaving as though they love that person with their last breath. They basically stop being the kind of person they themselves would want to come home to.
And then I find myself thinking "Who the heck would want to come home to face themselves?"