I love you with all my heart 我全心全意爱你；我全心全意地爱着你；我全心全意的爱你

【例句】
If I could win your hand , I would be on the top of the world , I love you with all my heart forever! !
如果今生能与你牵手走过，我将站在世界之巅，我全心爱你到永远！

I love you with all my heart and soul and promise to be with you forever.
我全心全意地爱你，我承诺永远陪在你身边。