It really is simple: God made marriage. And He sets the rules.
Jesus taught that in His kingdom people don’t decide who they marry. God does. So if you’ve married but you didn’t do it God’s way, you’re not really married. And of course you can repent and move forward with finding your perfect mate—the one in all the world whom God made for you.
With this understanding, laws governing marriage and divorce in the Bible take on a whole new meaning, because now we see our relationships as either God ordained, which should never be broken up, or sins of the flesh, which can and should be repented of.
If God didn’t author it, it’s not a sin to repent of your vow and move on with His kingdom purposes for your life!