Jacen | Kol
She could. But she likes you. Has no reason to hold it against you and has every reason to work it through with you. That said, its happened once and you can't promise it won't again. Believe me, I know, even the best of intentions fall by the wayside sometimes.
You admitted your wrongs. Has she? Has your brother? Its got to be all or nothing or else there's no point.
But if you want my honest opinion. You could all do with focusing on yourselves. I'm not saying walk away as he has but, ask other opinions, you're all too close to this. And talking about it just the two or three of you, you'll never fix anything. Your minds are already fixed