Gaston saw her mostly with others.

Even a woman with a tender strain for a man knows what will serve for her ascendancy: the graciousness of her disposition, the occasional flash of her mother's temper, and her sense of being superior to a situation--the gift of every well-bred English girl.
Cluny Vosse was also at the house, and his devotion was divided between Delia and Gaston.

Cluny was a great favourite, and Agatha Gasgoyne, who had a wild sense of humour, egged him on with her sister, which gave Delia enough to do.

At last Cluny, in a burst of confidence, declared that he meant to propose to Delia.

Agatha then became serious, and said that Delia was at least four years older than himself, that he was just her--Agatha's--age, and that the other match would be very unsuitable.
This put Cluny on Delia's defence, and he praised her youth, and hinted at his own elderliness.