Is this guy behaving ethically? He wants to break up after proposing?

Anonymous

A guy visits a hooker and like the experience. He visits her many times and eventually proposes to her. She is so happy that she gets a boring day job and moves into his apartment. Now he wants to breakup, saying that her sister may not approve of a hooker as his wife.

What can a girl do in order not to be conned like this? Should all guys thrash this guy so that he learns his lessen?

Is this guy behaving ethically? He wants to break up after proposing?
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