YOU SAID:

but I thought you left me for a better reason than that

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あなた私がするより良い理由と思ったが、

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You are better than I thought because

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思ったより優れてる

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I'm better than I thought

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私は思ったより

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Than I thought

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だと思ってたけど

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I thought

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だと思ってたけど

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I thought