Over many years, I've come to see that one thing you can count on is that things will change. Setting aside issues of infidelity or abuse, letting a little time pass and getting some help with communication can clear the air and help some people to get on with it. It has taken me many years to realize all this, too late for my own marriage, but now when friends ask me what I think about their situation, I always suggest they take their time, consult a therapist, and wait until their decision can be made for "reasons" rather than in anger or grief.