用英语翻译“爱而不得本就是人间常事”是啥?

(Source: Zhihu)
(answered by: alexcwlin; edited by: Adam Lam)

Chinese: 爱而不得本就是人间常事
English: In truth, love in vain happens all the time in this world.

（百度翻译互助吧）村姑姐:

Yes, yes, yes, unrequited love is commonplace in everyday life. sadly so.

回复 村姑姐☜ : 
Lassie, "unrequited love", another term for "unreciprocated/one-sided love", or 单恋，is not quite the same as "unfruitful/fruitless/in-vain love爱而不得", which could include situation where there was love between the two at one point but ended with nothing in the relationship.