Why do people only do effort after they get divorced?

I was watching cartoons with my daughter about a mermaid and a shark, they are a couple. The mermaid stop giving attention to the shark and he started exercising after she left to make himself look better, but it was a misunderstanding and she loves him very much. Kids stories always have happy endings lol

So in real life, when a couple get married, the woman tends to let themselves go, especially after pregnancy. Some don't even put on a little mascara or try to loose the extra weight. Then the man's eyes start wondering and when he cheats, he's the monster. And this can go both ways, I'm just using this version as an example.

Anyways, so they get divorced, the man is the monster, and suddenly the woman start exercising again to get back in shape and make herself look attractive.

Why don't they (or you) do that effort DURING the marriage for the person they chose to marry.

I know marriage isn't about just looks, but attraction does play a role too. Even in nature, the female bird won't chose to mate with a male whose colors isn't bright enough.

Why do people only do effort after they get divorced?
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