Jesus words "Let no man put asunder what God has joined together" helped me to stay firm in my commitment to marriage, even when my wife had made it quite clear that she was done, that she was planning to divorce me, and that she no longer wanted to try to reconcile our marriage.
She did ask me to agree to a dissolution of our marriage. I firmly, but politely, refused. My legal understanding of a dissolution is that you and your spouse jointly agree on all the issues of dissolution as far as finances, child custody, etc., and then you ask a judge to terminate your marriage. To me, to go through that process, would be for me to be a part of "putting asunder what God had joined together."
So, the only option my wife was left with was to file for divorce, which is a lawsuit where one party asks the judge to terminate the marriage. Under no-fault divorce laws a spouse can eventually get a divorce.
Thankfully, she never took action to file for divorce. I am glad I did say no to the dissolution, even though it would have been seemingly the easier, cheaper way out at the time. I didn't think it was the Godly way to go about ending our marriage when He had made it so clear that He hates divorce and that He doesn't want us putting our marriages asunder.
It seems to me that Jesus very closely linked his command, "Let no man put asunder what God has joined together" with His statement "The two shall become one flesh".
(See prior post about "One Flesh")