Dear Bones,
I know that right now you are probably cursing my name. I know why and I deserve it. After all, I had promised to never leave you and I did. I didn't even tell you that I was. I'm pretty sure that Cullen told you the reason and that I was unable to contact anyone before I left. That, however, doesn't excuse me from breaking my promise to you. You always told me not to make a promise I wasn't sure if I could keep. I had really planned to keep this one to you. I'm sorry, Bones. I really am.
To be truthful, I really disliked you when we first met. You were stubborn and used your intelligence against me, or at least that was what I had thought at that time. Now, I know that you simply didn't know how to interact with people that were of lower intelligence than you and the other Squints. I really hope that you will continue to work with the FBI and get you a new partner. You were extremely good at catching the bad guys. You should continue because you love it. I know you do. However, you may have to start being more careful as I won't be there to save you all of the time.
I know that you are going to hate having to get a new partner if you decide to continue as the liaison to the FBI. They won't know what I know and they won't trust you like I do. Hell, they won't even understand much of what you say, if anything. Just don't shoot them, ok? They might not be so forgiving as I was. Please don't go kicking gang leader's asses either. You don't know what I had to do to get that hit taken off of you. Your new partner might not like you so much.
If it isn't too much trouble, I would like you to continue to see Parker. He really loves you, Bones. We all do; the Squint Squad, Parker, your family, and I. You are a part of our family. Remember what I said, there are more than one type of family. You are lucky enough to have your real family back now and to have the family that took you in when you didn't. Be glad and count your blessings.
Bones, I have to thank you for not hating me for what I had done in the past. You are the only person besides the people I served along side of that know anything about what happened and how that affected me. Most people would have called me a murderer and never talked to me again. My family doesn't even know what all happened. They know some of it, but I would rather them not know all of the truth.
Please go on in life with as much time outside of your lab as I forced you to take. Angela can always find somewhere for you two to go. Listen to her sometimes, yeah? It'll be good for you. She can even teach you more of the pop references that I was teaching you. You were my best friend, Bones, and I don't want you to go back to shutting yourself in the lab just because I'm gone.
I love you,
Booth