As we grow older we tend to lost friends. It's pretty normal, the older we get, the more we tend to prioritize ourselves. We tend to adapt to the rush of the world causing us to lost friends. Anyway we doesn't need tons of vake friends. Real friends would stay. They would definitely understand that your world won't only revolves around them. We're getting older, we got lots of responsibilities. Try to understand each other. Even with distance, lack of time, a true friend would still be there. Would definitely stay.