Why do people stay in toxic relationships and hope things will be better someday?

Why do people, both men and woman stay in toxic relationships with no end to abuse for years thinking things will get better for them someday. Even when they find someone good they still think someone they are with is probably better. Why does people just go and find the one they love in the world?

I am talking about things where one hurts the other because marriage isn't about hurting each other but to protect each other and the children

Why do people stay in toxic relationships and hope things will be better someday?
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