How did Augustine St. Clare come to marry Marie?

Austine had hoped to marry another and was heartbroken. He married Marie on the rebound. She was beautiful, monied, and available. 

Stung to madness, he vainly hoped, as many another has done, to fling the whole thing from his heart by one desperate effort. Too proud to supplicate or seek explanation, he threw himself at once into a whirl of fashionable society, and in a fortnight from the time of the fatal letter was the accepted lover of the reigning belle of the season; and as soon as arrangements could be made, he became the husband of a fine figure, a pair of bright dark eyes, and a hundred thousand dollars; and, of course, everybody thought him a happy fellow.