When writing a love letter, detail how life has changed for the better because of your boyfriend. Describe how missed he is when you are apart from him, and explain that you cannot imagine what your life would be like without him.
When writing the love letter, find a secluded place and play romantic, soft music. Do whatever it takes to stimulate a romantic mood. This ambiance allows you to create a great romantic letter.
Make sure to date your love letter with the month, day and year, as the letter is to be remembered and treasured as a keepsake. Ensure that you pick an endearing salutation that is not formal, such as "My darling. Start the letter by explaining the reasons for writing it. Do not be timid in the letter, as the message and heartfelt words may be misunderstood or fall flat.
The presentation of your love letter is paramount. Purchase beautiful stationery in cream, white, neutral or another soft color. Use a flair pen that has brown or black ink. Avoid using blue, green or red. Keep in mind that the love letter is being written to someone special, so handwriting the letter is best. Keep the letter personal and not business-like.