I still think that Sansa is destined to kill LF. So, in my mind, that means they have to be together for a while longer. I hope what is going to happen is that Sansa is going to beat him at his own game. She is inexperienced compared to him, but she has him in the palm of her hand because of his feelings for her. He'll try to turn her against Jon. Maybe he'll even succeed, but it will be a short-lived victory, because she'll trick and kill him in the end.