What that makes a man become abusive to his girlfriend/Wife but nice to another people?

Anonymous
I know someone who cruel to his girlfriend/Wife and sometimes to his child also. But really nice and polite to another people. He said rude words and degraded. Why is that?
And why his girlfriend/Wife still in love with him n follow him even though they really often felt hurt and cried?
Lots of people already told her to leave him but she keep staying.
Why he act like that?
Why she act like that?
Why they dont just separate.
What that makes a man become abusive to his girlfriend/Wife but nice to another people?
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