Formal:
* Mon cœur vous aime. (This is the most literal and formal translation.)
* Je vous aime de tout mon cœur. (This means "I love you with all my heart" and is slightly more affectionate.)
Informal:
* Mon cœur t'aime. (This is a more informal and familiar translation, using the informal "tu" instead of the formal "vous.")
* Je t'aime de tout mon cœur. (This is the informal version of the previous option.)
* Je t'aime à la folie. (This is a more poetic way of saying "I love you madly" and is suitable for a romantic context.)
Choosing the right translation:
Consider the context and your relationship with the person you are speaking to when choosing the best translation. If you are speaking to someone you don't know well, or in a formal setting, use the formal options. If you are speaking to a friend or loved one, the informal options are more appropriate.