Most Helpful Girl
I probably would have told you, @SOph5t3R, to allow these sleeping dogs to lie with this guy, had I not just Saw the 'He text me on Valentine's day...'
I believe that you are now letting your conscientious get the best of you, and a closure is badly Needed for You to even move on.
Yes, pour your own heart out in a Nice and heartfelt Letter to him, explaining everything you are feeling with all the dealing. This is more appropriate and will probably have more meaning if you do it in this style and maybe even make Him... Smile.
Like every dog who his own day, every "EX" has theirs and this could be your own "Hey day."
Good luck. xx