Dificil traducir algo tan romántico y poético pero aquí va mi intento
Saludos
"I would like to be in your life something more that just a moment, more than just a shadow. I want to be yearning, a non-vanishing trace and a steadfast memory. I want to be in your life sorrow induced by absence, pain created by distance and an everlasting friendship. I want to mean more than an image that arrives overcoming obstacles, passes you by and then is gone. I hope I mean that much to you because that is exactly what you mean to me.