There are so many reasons why a thriving marriage could crumble to a partner wanting a divorce. Maybe it was An affair, distance, misunderstanding, psychological problems, and even addictions.

Although, all the above-mentioned pose threats to marriage, they can be handled; however, a marriage truly begins to crumble due to a lack of

Communication: anger or dispute is not a strong basis to end a marriage. With good communication between couples, these issues can be thrashed out.
Love and intimacy: people who have a mutual commitment with one another would be able to overlook disputes.

However, at the point where one partner wants a divorce, what should you do?
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https://everythingdating.com.ng/how-to-save-your-marriage-from-a-divorce/

you CANT save your marriage from divorce, if its done then its done and no matter what you do can/will change that

This thing no get formula o.
If the two people are determined to make it work, e go work.
If it's one sided effort, divorce is inevitable.