Yes, fear, the most base of emotions. I guess that's what we are all trying to overcome is the fear of what "might" be. This is exactly where emotional detachment comes in, if we are not affected by what our spouse does, says, acts, then obviously we are not afraid of what might be. Interesting concepts, in theory. Put into practice, it takes a lot of fortitude.
"Achieve success, but without vanity; Achieve success, but without aggression; Achieve success, but without gain; Achieve success, but without force." Lao Tzu