Why does a boy makes a girl look as characterless before others, demeans her character, goes out of way to make her feel bad, tries to break her life?

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Update : He loved her in past. She didn't reciprocate to him. He started getting too violent and emotionally torturing her. Why?
Why does a boy makes a girl look as characterless before others, demeans her character, goes out of way to make her feel bad, tries to break her life?
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