So, if you have said or done something that has hurt your girlfriend ... love of my life. I'm determined to make sure I never ...

But for the past five years, he has written a string of letters to pledge his undying love for her ... Special', in which he wrote: "As my sweet girlfriend, you have been there for me." ...

Nine letters written in the '80s by Barack Obama to his college girlfriend ... that my concern for you is as wide as the air, my confidence in you as deep as the sea, my love rich and plentiful ...