What are grounds for Divorce?

  If you are married, you've bound yourself to that person for your entire life, you have made a spiritual union with them and you said only death can you part...Why would or did you, if you even consider that being an option, get a divorce? They say divorce rates are high, but it's actually a 50/50 ratio on life long marriages to divorces, but why even that statistic? 

  My husband and I are fascinated with neuroscience and psychology. We are not relationship therapists, but we tend to be the ones people come to get a third perspective when a conflict arises. We both find a lot of conflicts in relationships stem from poor communication. We believe marriage is not something anyone should take lightly. It's a serious commitment to a person. They're viewed as your first of kin afterwards, and to me, going through a divorce is like discarding an immediate loved family member. I know in some instances, burning bridges with family members is necessary, but it doesn't change that you're related to them. 

   I can understand there are exceptions to reasoning such as abuse, but aside from doing it for the safety of your life, what else? 

  Also, if you could share any tips or tricks on how to help a problematic marriage, please share!