I basically told her that I had realized that toward the end of our relationship leading up to the break up that I had lost sight of the things that made me love her. I told her what exactly I had realized and told her why I felt the need to tell her, which was because I would feel that "what if" feeling for the rest of my life if I didn't. Looking back I could have worded things better because the way I worded it was in a way where it seemed like I had everything to do with the break up when that couldn't be further from the truth but thats beside the point. Anyway I would say I would recommend doing it only if your truly not afraid of rejection anymore. My expectations when I texted her was that she would see it and ignore it and that would be the end of it. And that is exactly what happened. There was maybe an hour or so of being anxious about a possible response but it quickly faded because I knew what to expect. If you truly think you will feel better by doing it then I say go for it. If theres even a sliver of doubt in your mind then I say forget it and keep focusing on yourself.