For someone really special and important in my life:

My dear,
when you'll read this you will think that it's just bullshit. You are free to believe what you want, however I assure you that this is coming straight from my heart.
I am really sorry that I'm such a difficult person to be with. I've failed in everything and now I'm failing you, the only thing in my life which gives me hope. As the song says: 'words don't come easy', and right now I don't know what to say. I just want to give you my heartfelt apologies for all the wrong I have done to you during these months.

"Some words are like rays of sunshine
others like barbed arrows or the bite of a serpent."

Lately mine words were like the latter, but I sincerely promise you that I will do my utmost not to hurt you and to say only the words which are like the rays of the sun, rather than the bite of a serpent.
Believe it or not I do love you, even though I do not show it in the best of ways. I know that this is not enough, but I hope it is a good first step towards redemption.
I love you my dear, thank you for everything