I just need on advice on writing a love letter. I've finally found the person that I want to spend the rest of my life with. I want to write them a really, really good love letter. Maybe even perfect. So, I guess this goes out to anyone who's written one to someone, received one, or even both. What should I generally go for or look for when writing a love letter?
Edit: I tend to belittle myself or be demeaning in some way, like "because of my flaws i did this" and stuff like that. Negativity is a no-no in love letters, right?