"Who's running?" Remus snapped. "I'm here, aren't I? I've spent the past several days being tailed by a Death Eater, and were I around Tonks, she'd be in danger, too!" She was already in danger, at the Ministry, and he was concerned for her, but he still felt she was better off without him around.
He stood, fists clenched, glaring at Bill. "Do you think I don't regret it? That I don't love her? Or my child?" He snorted like an angry horse. "I have lost every person I've ever loved, Bill, and I've not had the fortune to be close with many. I am ashamed! I'm ashamed that I allowed myself her love and ruined her life. None of it would have happened if I hadn't been so selfish!"
Aberforth began to say something but Remus reached out a hand, silencing him. "Don't. Let me speak to him. If he wants to involve himself, then I'll oblige." His temper was very close to getting out of hand, as it had with Harry, but if Bill thought he could come in and judge Remus on one sole act, he was not as clever or understanding as Remus thought he was. And he was walking towards the door. That made Remus angrier, somehow, that he wasn't even given the chance to form a response, and he strode forward, sealing the entryway with a spell.
"You listen to me," he said hoarsely. "I can't tell you what will happen to your children; I am not even sure what will happen to mine. But if the thought of your children being affected worries you, then maybe you'll understand, and at least you'll be able to be with them during the full moon - to care for them. I haven't been afforded the privilege. So if you think you could live with yourself, as I have to live with myself, then perhaps you are a better man than I."