First of all, you're handling all of these grown up challenges super well. Moving? You crushed that even though we had no idea how to use the tools. Definition of "family" changed for you? You're moving forward and taking the new challenges that come with that in stride. Break up? You know that I always think that you're too good for everyone... I am certain I will think that about the next guy too.
Now that we have established how well YOU are doing... I've got to say... this change is hard for me. (Isn't it just like me to have a problem with YOUR change?... hear me out though.)
I am so proud of you and so equally scared that this is the end of "us". Our lives as we know it... the spontaneous hangouts, the coffee dates, the weekends together... all of that is changing, ending, and crushing down on us rapidly. I realize that this is the last thing on your mind because you are thrilled (or horrified...depending on the moment) and it is my duty as your friend to solve this problem before it becomes an actual problem. So don't worry: I got you.
While our friendship may not remain a priority for the two of us, I promise to care about your changes as much as my own. I promise to love your kid, love your new home, or love your new career, as much as you have loved and supported me in any of my own life changes. I promise to learn about the crisis of human trafficking, or the hardness of bamboo floors, or gain a general knowledge of babies if you promise to remember that I love you, and I am here for you no matter what.
So, to my friend that is embarking upon a new change... You got this... and so do I. As always, together, we can do anything. Our lives may change, but the fact that we are friends never has to. Thank you for always supporting me... now it's my turn to support you and I cannot wait.