Me and my ex broke up quite a while back but i still have feelings for him… I want to write him a letter. What should i say in the letter?

I have just heard stories from friends of friends that their significant other got back with their ex surprisingly. I just wanted to know how often have you heard this happening and what the reasons for it are. Thanks for your help.

I really want to get back with my ex. Ladies (or gents) how the heck can i do this? We are in college. I really like her. I believe i am now stuck in the friendzone. Any ways that I can get her to see me like she once did?