It was difficult for Tonks to listen to Remus speak about Sirius and the sort of relationship they'd had. She didn't want to hear it; all she wanted to know was that Remus had never cheated with her, and he'd already answered that. But she didn't interrupt him. "It's all right," she said softly when he finished. It had happened before they'd known each other, and she could hardly hold his past against him.
She took a slow, deep breath as he answered her. It wasn't the response she'd hoped for, and something inside of her deflated. Hope, maybe, though she couldn't be sure. Whatever it was, it wasn't pleasant to be without it. With his answer, she became certain that he'd done this--snogged George and revealed his past with Sirius, though whether or not he'd been misleading on purpose, she wasn't sure--as an excuse not to be with her. And that hurt.
"Don't tell me what I deserve," she said, an edge to her voice. "I know what I deserve. I deserve someone who wants to be with me so badly that life is miserable without me. I deserve someone who loves me so much that he can't imagine walking away. I deserve someone who doesn't snog other people when they're feeling insecure or getting cold feet. I also know what I want, and for some ungodly reason, that happens to be you."
She swallowed tightly. "I'm aware of the risks, Remus. I always have been, and it ought to tell you something when I keep choosing you again and again, hoping one day you'll love me half as much as I love you. Maybe that makes me mad or delusional, but I can't ignore the part where you don't think you deserve me. I get that this might happen again, but what if it doesn't? Why walk away from the possibility of happiness like that on an uncertainty you can control? If you don't want to be with me, say so. If you have other prospects in your life that are more exciting or satisfying than having a family and a life with me, then okay. I won't hold you back from that. But don't you dare break up with me because you think I deserve better. I deserve to have what I want, and what I want is you. I also deserve someone who wants me in return, and if that isn't you, just say so now so we can finish this with as little heartbreak as possible."