Merci chérie
"Sweetheart" is most often rendered as "Chérie" (fem.) and "chéri" (masc.) in French.
Mon chéri.
Thank you is "merci" in French.
ma petit chou
Thank you is 'Merci' in French
Thank you Ma'am is 'merci madame' in French.
Là où êtes vous amoureux
ce qu' une petit amie
Thank you in French is Merci. How are you in French is Ça va? or Comment ça va?. Thank you and how are you in French is Merci et ça va?.
Bonne nuit mon Cher
tu me manques mon cœur
The most common and simple way to say "thank you" in French is: Merci.