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Because that's how the writer(s) decided to end the story. Or perhaps it was the director's decision. Either way, this is the story the filmmakers wanted to tell.
Also, I'm with you. I wish it had ended that way too. But Sandler's character didn't want to break up his family, and further traumatized his children. And maybe, just maybe, Leoni's character will change in the future.
But it is definitely a bittersweet ending.