Summary: The simplest of the words can express your true love to your sweetheart. In addition, the best way to do so can be through a love letter. This would last forever and you can share it even years after you have been together. This best romantic letter will remind your love to her. She will feel that true feelings through these simple and romantic words.
Hey Darling,
I love you from the deepest part of my heart. Whenever I am with you I feel the warmth and love that gives me strength to carry on. You complete me and I am nothing without you. Even with your touch and love, I get the happiness, which cannot be compared, to anything.
I hope that I am caring you enough that you agree to spend rest of your life with me. Whenever you touch me my heart desire your love more. I will do anything to make you happiest person the earth because you are my sweetheart. I wish to be with you always.
Kisses and hugs
Vivek