Dear …
As I sit down to write to you today, I am flooded with memories of days gone by. I remember times when we laughed often together. Do you remember when __(briefly describe a moment that you fondly remember)__? I actually believe that is the defining moment for me; the moment when I knew that you are extra special to me.
It boggles my mind as to how I could have thrown that all away. I know I __(behaved badly/said some unforgivable things/etc.)__ the night of __(place or event)__ without even having the decency to give you much of an apology afterwards. Believe me, I have had plenty of time to think about how __(bad it really was/hurtful those words were/etc.)__ that night and I suppose that’s why I haven’t contacted you all this time. More embarrassment, I think, than anything. I also realize that’s the moment I single-handedly derailed any possibility of __(dating you seriously/having a solid relationship with you/etc.)__.
But the truth is, I have never been able to stop thinking of you __(Name)__. Over the years, I have endlessly gone over scene after scene in my mind of how I could make it up to you so that we could start anew. There’s nothing I wouldn’t do to take it all back if only you could find it in your heart to totally forgive me.
I’ve had time to mature a lot since __(place in time that the incident happened)__. And, I’ve had ample time to know for sure what I want. I can no longer deny that it’s been you all along who I’ve wanted to date. You fill my thoughts constantly. I even admit that I’ve found it __(difficult/hard)__ to date anyone else because, truthfully, there is no one who can compare to you.
I would go to the ends of the earth to be with you, __(Name)__. That is honestly how I feel about you. You are forever __(in my heart/on my mind/etc.)__.
Yours always,