One of life's small sad facts is there are people we no longer see who nevertheless gave us some of our best or most important experiences. But they don't know it and never will. That's because we didn't know it until much later, looking back.
But I think I know how it feels. It's... heavy. And it hurts. And even when you're not thinking about it, you still feel this... weight, because it never really goes away. That feeling will drown you, if you let it. But we won't let it. We won't let you drown.