That's just a fixed expression and there is almost no reason why. 😉😊
2021年3月8日
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Each language has its own logic.
2021年3月8日
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because in English logic "with" shows a togetherness. "by" in this context doesn't make sense as it would mean you made her fall in love, but maybe you're not the person who she loves!
2021年3月8日
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It's just a fixed prepositional phrase. They vary a lot between languages and there's rarely an explanation for 'why'; it's just something to memorise.
'In love' goes with 'with'. In French and Italian it goes with the equivalent of 'of'. Etc.
Matt
2021年3月8日
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If you are looking for logic in any language... don't waste your time learning a language. Your question is... not very smart.