Why do some people think they are entitled to a partner way beyond their league?

I know that you could argue if league exist but in some cases it’s very obvious that one partner is way more accomplished and more desired than his partner. Yet for some reason you see couples were the unattractive guy acts like the prize and doesn’t appreciate his beautiful smart lovely girlfriend and treats her with disrespect all the time. Why is that the case?

Why do some people think they are entitled to a partner way beyond their league?
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