Dear GC,
Sorry, for how I have treated you. 
I was only a foolish teenager with a great coarse in mind. 
We stay together in the worst period of my life. 
Now I am a new person, a young women, able to genuinely love. 
I think I still love you because I cannot let go the idea of us as a couple in the future.
Now we are dating again but you are emotionally unavailable because a still present heartbreak caused by your last relationship and probably because you do not trust me and my feelings.
I hope to change your mind and make you fall in love again.
I do not want to break you heart another time. I just want you to be mine forever.