Mello found, soon after leaving Whammy's, that he desperately needs Matt.
Mello was a badass and a fucking genius. Guns, the Mafia, and of course chocolate, and he should have been content, but... Sometimes, when he was alone, the fucking badass genius wonders what the point is if he has no one, and picturing soft auburn hair, gentle pink lips, and eyes hidden behind goggles, a stream of hot wetness pours down his cheeks.
Matt knew from the moment he saw Mello that he desperatly needed the beautiful child.
And as the beautiful child grew into a hot-as-all-hell teenager, Matt needs him even more. But then he leaves, and Matt is alone. Matt's life is turned upside down. All that's left is games, cigarretes, loneliness, and bitter, salty tears.
When Mello wakes up to intense pain coursing through his burned, scarred body and once his vision clears and he sees Matt, all either of them can do is cry. Afterwards, pretending that it had never happened, they had not just spent the past half hour sobbing at each other (and would have been clutching each other if Matt weren't horrified of hurting Mello,) Matt takes care of Mello until he can take care of himself, and they try not to hate each other and themselves.
And just as they're starting not to, Mello leaves again.
And lonelinesss, emptiness, nothingness crushes Matt, suffocates him.
And he doesn't know what to do.