Hi there. Every relationship has ups and downs. It's better to talk and sort out the differences before taking major life changing decisions like divorce.. as divorce affects not only husband and wife but even children are affected. As you haven't mentioned about kids I assume they don't have kids yet. I suggest they spend more quality time, talk about difference, discuss the problems. If that doesn't work please consult psychiatrist or marriage counselor. If none of these works and physical and mental harassment is being done then may be divorce step should be considered..