你何必要为难她呢？

Nǐ hébìyào wéinán tā ne?

Must you bother her?

事情已经过去了，你何必这么在意呢？

Shìqing yǐjīng guòqù le, nǐ hébì zhème zàiyì ne?

It's over, do you need to care so much?

何必担心那么多？一切都会好起来的。

Hébì dānxīn nàme duō? Yīqiè dōuhuì hǎo qǐlái de.

Why worry so much? Everything will be fine.