If a girl found a good guy who didn’t treat her poor like her ex boyfriend did why would she abuse and mistreat him?

So I am nothing like her ex, her ex would often times sexually manipulate her and pressure her into doing sexual acts. I’m not a big sexual person it’s more romantic connection that I’m invested in but anyways during the relationship I found myself on the receiving end of physical and verbal abuse from her

If a girl found a good guy who didn’t treat her poor like her ex boyfriend did why would she abuse and mistreat him?
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