Refers to a situation where one person has romantic feelings or intentions for another, but those feelings are not reciprocated; unrequited love or one-sided affection.
他对她一往情深，但她对他毫无感觉，这真是落花有意，流水无情啊。
He was deeply in love with her, but she had no feelings for him; it was truly a case of unrequited affection.
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