He can't mistake the sadness in her eyes when she says yes. He can't really blame her, either.
He didn't have to offer; he knows she can take care of herself.
But he would never do that. His mother would never forgive him. His brothers would never forgive him.
Fred would never forgive him.
So instead he offers himself, the broken shell of a man that he's become, and she accepts, only because she doesn't have anything else.
He hesitantly places a hand on her stomach, and decides then and there that he will be better than what he's become.