There's no need to severely care what doesn't belong to you.

问题描述:

There's no need to severely care what doesn't belong to you.

没有必要太关心不属于你

不属于你的东西,不必太在意。

不属于自己的,又何必拼了命的去在乎.
severely是激烈严格的,这里翻译成拼命地

没有必要去认真在乎(关注)不属于你的东西