I feel like I could understand it better if it's explicitly clear from their scenes that it's obviously meant to be platonic and nothing more, but that's not the vibe I get from Bellarke scenes. Especially in season 5. And no matter what Jason says offscreen, I truly believe that it's his intention to keep things vague, to make viewers believe that maybe it'll happen. And that's not right, to string people along like this.
Glad that you liked the fics.
Still feeling bummed out right now but I hope to start reading some of those soon, too.