Dear Sir, I want you to know, I do not write this because I am mad at you. The fact is, I am jealous of you. You are starting a life with my ex, and that is fine with me. But by starting a life with my ex, that means you're starting a life with my son as well. Due to circumstances, and my ex's wishes, I am not in my sons life. You will be though. Please know, this is nothing against you, and I would feel this way about any man that may be taking the father role for my son. I hope you treat him like he is your own. I hope you're there to teach him, help him, encourage him, and love him as if you created him. It breaks me to think that he may call you dad, because it will not be me he is calling dad. It tears my heart apart to think that he may say "I love you" to you, because it won't be me he is saying "I love you" to. I won't be there to see him go to school on the first day. I won't be there to teach him how to ride a bike. I won't be there to teach him how to play catch, or hit a baseball. I won't be there to help him learn to drive a car. I won't be there when he goes on his first date, and give him advice on how to be a proper gentleman. I am going to be missing out on a lot, but you will be there. I do not hate you, but rather I envy you. You will be in my sons life, doing the things I should be doing. Please don't take that for granted. Please be the father to my son that I will never get the be. Let him know he is loved. Let him know that he is intelligent. Let him know you are proud of him. Even if you have other children, don't ever forget about him. He didn't choose this situation, but you can choose to make it the best possible for him. Please do so. Thank you.