TO LOVE IS TO BURY.
This is a secret, and he'd never say it in a million years because it's supposed to be long over, but Gunn never, ever stops loving Fred. Not when she inches away from him until their bodies don't touch in their bed, not when she's mumbling at the floor about things not being right and not later, when he sees the lingering looks she's sharing with Wesley. He knows in some ways he'll always love Fred Burkle, because how could he not?
She is the light and she is everything that's right in a world that used to feel like it was so full of nothing but wrong. He's twelve when he stakes his first vamp and from then on he never looks back, never thinks about the future – he's twenty-four when he falls in love and he can't help but picture his future and hers, living in the suburbs with 2.4 kids and a dog (it's not really them, he knows, probably never will be - but still, it'd be nice, someday, maybe).
Now when he looks at Wesley looking at Fred, he can see reflections of those dreams in the other man's eyes. It makes him livid, sometimes, just thinking about it, not that he'd say anything – it's supposed to be long over, after all. She's moved on, so has he; it's his story and he's sticking to it, but he buries himself in his work and pointedly ignores Lorne's well-meaning attempts to set him up with the latest starlet-to-be.
The funny thing is, Gunn's always known, in a way, that things would work out like this – he just forgot that he knew it, somewhere along the line, and now he's paying the price.
Wesley comes into his office with some legal query and the dazedly-happy expression he's taken to wearing these days, and for a split second Gunn considers punching him in the stomach, because he knows exactly how Wesley feels and he knows what it's like to lose that feeling. He wonders if they go to breakfast together at some crummy diner, if Wesley laughs as Fred finishes her pancakes and the remainder of his, if Wes really and truly knows how lucky he is that a woman like Fred will look his way, and if he'll be better at holding onto what they have than Gunn was. He really, really, really wants to punch Wesley.
He answers the other man's question and goes back to his paperwork.