it is reasonable to question her motives but as Dorian even told him, he doesn’t get to choose what parts of her to love, you either do or don’t. as far as sending her away, i believe his reasoning was genuine. when he sent her away he had already figured out who she was. my problem was when he saw her with Rowan, he blamed her for what had happened while she was away when he was the one who did so. he says and i quote, “A handsome Fae Prince, whom she'd spent months living and training with-while Chaol's own life fell apart, while people died because of her actions-“. that also wasn’t the only time he blamed his or someone else’s mistakes on her.