Have you ever lost a friend?

Not due to death, but to "moving on". A friend who you talked to often, and filled in the lonely times for each other. You helped them out when they were down, and they helped you out when you were down. Then they have a moment of breakthrough, and realize that they need to be a stronger person and do this on their own. So they decide to break ties with you. And you are so happy for them that they are moving forward and acheiving their dreams for their life. But then you are also sad, because you miss them. You miss their company. You miss them being there. You know that they are still out there, but you wish sometimes that you knew where they were, how they were doing. You know they'll be doing something great in their life, and you're so proud of them, but in a way you wish that you could be there in their good times as well, sharing in their happy moments. It can be a difficult roller coaster of emotions. Has anyone ever been through something like that?