He hides behind his glasses because his eyes say it all, and he doesn't trust them to speak anything but what he's trying to hide. He doesn't want her pity, or her negativity, and he doesn't want her beautiful amber brown eyes to look at him in such a way that he fears he may never be happy again.
He wants her to sit down and talk to him like she does sometimes, wants her to flip her golden brown hair happily as she speaks, though she doesn't know she is doing it, he's sure. He wants her to smile brightly at him and crack a joke about anything other than her partner, so he can allow himself to think that her partner isn't the only thing on her mind.
He wants, oh how he wants - He is snapped out of his brooding pleasantly by something warmly touching his face, briefly. He looks up and finds Olivia carefully removing his glasses, and he smiles.
"What are you doing that for?" he teases, blinking up at her blearily.
"I just wanted to see if there was a John Munch behind those glasses after all," She winks, "They hide you're eyes, you know."
"I know," He whispers, awed.
It's moments like these that make him freely willing to admit to himself, that all he can ever want is her love.