Informal:
* Merci mon amour: This is the most direct translation and the most commonly used phrase. It literally means "Thank you my love."
* Merci chérie: This is another common option, especially for couples. "Chérie" means "darling" or "sweetheart".
* Merci mon cœur: This translates to "Thank you my heart". It is a more romantic option.
* Merci beaucoup mon amour: This is a more emphatic way of saying "Thank you very much my love."
Formal:
* Merci beaucoup, mon amour: This is a more formal way to say "Thank you very much my love."
It's important to consider the relationship between you and the person you are speaking to. If you are in a close relationship, the informal options are appropriate. If you are in a more formal relationship, use the formal option.