andrew's reason told him all these marriages were dismal failures. what are the reasons that make him reach this conclusion?

Andrew reaches the conclusion that all these marriages were dismal failures based on the episode he had witnessed at Cardiff station. It obsessed him morbidly as he thought about Bramwell, who was foolishly devoted to a woman who deceived him sordidly. Then he thought of Edward Page who was bound a shrewish Blodwen, of Denny who was living an unhappy life being away from his wife. All these relationships led him to draw such a conclusion and he winced from this realization. He wished to consider marriage as an idyllic state but he could not do so with the image of Christine before him. Her shining eyes admitted no other conclusion. He was conflicted between listening to his level head or overflowing heart, leaving him resentful and confused.