I think that men evolve over the years. It becomes impossible for their wives to evolve with them because women sometimes feel this need to become “someone else’ in order to pacify their spouses. These women no longer have self-identities. So there is nothing fueling the relationship. There is no diversity, variety, opinions, passion, mind blowing sex, make-up to break up sex, and etc. There is no change in routine, consistency and boredom are two factors that can kill a marriage!