[Your letterhead, if desired; if not, your return address]
[Date of letter-month, day, and year]
[Recipient's first and last names]
[Street or P.O. box address]
[City, State ZIP code]
Dear [recipient's name]:
I've been trying to figure out how to tell you everything I want to say and have been doing a lot of thinking lately, ever since our relationship ended so sadly. I really regret how things turned out and want to tell you I'm so very sorry for any ways that I hurt your feelings or let you down. I sure did not mean to do that-I care for you too much. I really want us to try again with our relationship. Are you at all open to this? I will give you a call really soon so we can talk.
I miss you more than you know. I hope you have a very Happy Valentine's Day…I sure wish I could be spending the day with you.
[Sender's first and last names]