The last time that Lily had agreed to meet with Snape, James had vehemently discouraged her. He hadn't forbidden her, because it wasn't his place, they'd only just started dating, but he had strongly warned her about it. (He'd seen how these sorts of visits had played out in the past, heard from Remus and her other friends how upset Snape always made her, had even seen her himself once while she was crying quietly in a corner of the Gryffindor Common Room, her head bent over a piece of parchment on which she was writing with shaking hands.) The discussion had lead to a fight, both of them shouting at each other and stomping out of the room, but when he'd walked into the Head Dorms to find her sobbing in her room after the inevitable blow out with Snape, he hadn't said "I told you so." He'd only gathered her into his arms and stroked her hair and whispered soft things, his lips pressed to her forehead.
But when Snape asked Lily to meet him again, she knew that James wouldn't be as understanding the second time around. So she hadn't told him.
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