Love, Regret and So Very Sorry!
Heather, I know it's been a long time since either of us has made mention of "us". You've moved on, so have I, to a certain extent. But there's a little voice inside, that I hear when it's quiet, that tells me just how badly I blew the best thing I ever had.
It took me a long time to understand the ways I had hurt you. I was so focused on how you could make me feel better about myself that I ignored all your needs, even when you practically screamed for them.
I could name off all the things I've done, but that may take awhile. I want you to know that I now understand how my selfishness and arrogance caused you to feel unloved, used, minimized, "unspecial". It's been a long time, but for what it's worth, I'm sorry, I'm so very sorry for the way I treated you.
I know you're with someone else now, and he seems like a great guy. I still care about you, but more than anything else, I want to know that you're happy, and with someone who'll love you like I... wouldn't. And if you've found that, I couldn't be happier for you.