Sirius thought about the two options Peter suggested. They were the extremes. And while Petunia was often a woman of extremes, humans were a lot more complicated than that. Both situations would hurt, if they happened. But they were both simple. If they happened, one way or another, there'd be a kind of closure. Sure if the first happened, there'd be pain and heartache for Peter feeling like he wasn't as really married to her as before. In the latter case, he'd then get to move on. But well, they were still the extremes. "That's possible," Sirius agreed, "Or it could land somewhere in the middle and be all more kinds of awkward and difficult and painful. There's no easy way about it, but that's not your fault."
The question was a good one, but Sirius already knew the answer as he judged it. "That's not stupid," Sirius replied, "That's the only way you can take care of yourself. And you matter. You're the one that's here. You're a great guy, Peter. You care about her. It's wonderful how in all this, you're being a lot more selfless than many folks are around here. But you have to do right by you, right by you and right by Juni. That's what you have been doing."