It's sad yes.
But I guess it's also just a natural part of life, and it still stands that sometimes people just go different ways on different paths regardless of the why, but it is not the end, as I've found already there will always be new opportunities and new people and new growth if you seek it out, because life stops for no one and should be cherished. Remembering the past is fine, but I'm also grateful for all that I've gained since then, my new friends who like me for who I am quirks and all, my newer love for things like Sabaton and anime, the rekindling of my love for history and collecting, and I've grown more confident and secure in myself overall. I have flourished since then and in the spirit of the season I only wish prosperity and happiness for them as well.