Formal:
* 晚安，我的爱人 (wǎn ān, wǒ de ài rén): This is the most formal way to say "goodnight, my love."
* 晚安，亲爱的 (wǎn ān, qīn ài de): This is slightly less formal and translates to "goodnight, dear."
Informal:
* 晚安，宝贝 (wǎn ān, bǎo bèi): This translates to "goodnight, baby" and is a very sweet and affectionate way to say goodnight.
* 晚安，我的爱 (wǎn ān, wǒ de ài): This is similar to "goodnight, my love" but slightly less formal.
Other options:
* 睡个好觉 (shuì ge hǎo jiào): This means "sleep well" and is a polite and common way to say goodnight.
* 梦里见 (mèng lǐ jiàn): This means "see you in my dreams" and is a romantic way to say goodnight.
The best way to say "goodnight my love" in Chinese depends on your relationship with the person you are speaking to and the tone you want to convey.