We're happy in love but melancholy when disappointed.

恋爱使我们欢乐，失恋使我们伤感。

youdao

Love can never be a balance. You want to be happy in love to be willing to hurt.

爱情永远不可能是天平。你想在爱情里幸福就要舍得伤心。

youdao

It's got nothing to do with realities that go into whom one loves and whom one could be happy in love with.

这和一个人爱谁，或是一个人爱谁会开心的现实，没有任何关系。

youdao

She next won a small part in a movie called "Love Happy."

VOA: special.2009.12.06

Happy in work or in love?

BBC: Hong Kong: Where worlds collide

Maybe all those commencement speakers would send more young people into the world likelier to be happy in their jobs if the speakers talked about love as a consequence of meaningful work instead of as the motivation for it.

WSJ: Carl McCoy: Dear Grads, Don't 'Do What You Love'

Like Mozart's opera, it involves a double love story, in which two happy couples don't necessarily trust each other.

NPR: Love and Anchovies: Catan's 'Salsipuedes'