Hi
my condolences that you're feeling sad about things with your friend, though it's great you're up for a chat here to work through it
You seem like an honest and heartfelt person, and these strong feelings mean you really care about the people around you. Even knowing your friend had the best intentions, feeling angry/ lonely is very normal and okay. And if you may be feeling worried that he's cut contact quite abruptly - it sounds to me like, for now, he just wants some time away to process and, like Zig said, you never know what'll happen in the future.
It's totally ok that you haven't talked to anyone about this yet. If you feel up to it, perhaps connect with some other friends or loved ones, not having to talk about this specifically, but just hanging out might help you move on from feeling lonely and put things into perspective if you're feeling lost. But if you'd prefer to manage feelings alone, I find Stormy's suggestion to write quite helpful - journalling/ writing in a diary helps me organise my thoughts and feelings surprisingly well when I feel like I don't know what to do. And... chocolate, or anything tasty might work too
we're here if you'd like to keep chatting :3
