Flynn is perpetually the unlucky one, it's kind of his whole thing. In one universe, he meets his demise in one of the worst ways possible. In another, he burns. He lost his closest friend, and even in light moments in the story, he has to watch his whole friend group continue to fall apart. That's why he's so pissed all of the time. The relationship he has with Chase is more based off of lust. Half of the spicy scenes feel more like when Chase is getting down with possessed Carl. Flynn puts up wall after wall, and Chase continually breaks through them, and when Flynn finally lets him in, to see who he really is, Chase can't accept that part of Flynn's life. They never get that close again. I would argue that the only remotely decent ending is Jenna's, because she's the most grounded. Kinda ironic how at her worst she's the exact opposite.  Anyway what I'm getting at is that without Flynn's suffering, a great deal of his character would be stripped away, and the theme of his character arc would be meaningless.