What do men mean when they say, “It’s cheaper to keep her”?

I’m not saying divorces are easy. But, I want to know what goes on through men’s minds when they say that. Like, why are refusing to let your wife go when you’re not happy with her anymore? What if she wants to leave you? Would you refuse and intentionally make it harder for her to leave? Or are you hoping she makes the first move? I just need more insights on this saying.
What do men mean when they say, “It’s cheaper to keep her”?
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