Let her make herself as charming to them as she can.

What matter?
He smiles at them in his heart; for has he not, over and above all the pretty things which he can say and do ten times as well as they, a talisman--a dozen talismans which are beyond their reach ?--in the strength of which he will go home and laugh over with her, amid sacred caresses, all which makes mean men mad?
But Elsley, alas for him, had neglected Lucia himself, and therefore dreaded comparison with any other man; and the suspicions which had taken root in him at Aberalva grew into ugly shape and strength.

However he was silent, and contented himself with coldness and all but rudeness.
There were excuses for him.

In the first place, it would have been an ugly thing to take notice of any man's attentions to a wife; it could not be done but upon the strongest grounds, and done in a way which would make a complete rupture necessary, so breaking up the party in a sufficiently unpleasant way.

Besides, to move in the matter at all would be to implicate Lucia; for, of whatsoever kind Campbell's attentions were, she evidently liked them; and a quarrel with her on that score was more than Elsley dared face.