And in response to ii3rittles:
Marriage vowels are MAN-MADE, not God-made sweetie. Marriage is a commitment to another human being, not to God. Don't get confused. Once you really get to know God you will come to realise that he represents TRUTH. And there is absolutely NO truth in deceiving your heart and another human being..
If someones unhappy in a relationship and feel they can no longer maintain that commitment, be true to your heart, your Self and your spouse and leave.