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less traveled pass ⇔ well-worn pass

To chose the one less traveled by has made all the difference.

race through someone's mind （考えなどが）（人）の頭の中を駆け巡る
Evil thoughts raced through my mind. よこしまな考えが頭の中を駆け巡った。

unrequited love 報われぬ恋、片思い
There's nothing worse than unrequited love. 片思いほどつらいものはない