Consequences of Prejudice
Mulch wanted Artemis and Holly to be happy, he just wished they hadn't decided they needed each other for that. He didn't want to think of two of his friends as disgusting perverts, but they were, and they didn't even have the decency to be discreet about it.
He tried to stay friendly anyway, but it was in his face every moment he was with them. He couldn't tell them, they'd just call him a bigot. He didn't realise how good he'd got at avoiding them until the day Foaly told him Artemis had died and Holly was back underground.