Why not?
He felt himself slighted, humiliated.

All these fatuous people irritated him, he was exasperated by the things which seemed to engross Elena's attention, and more particularly by Filippo del Monte, who leaned towards her every now and then to whisper something to her--scandal no doubt.

The Marchesa d'Ateleta now arrived, cheerful as ever.

Her laugh, out of the centre of the circle of men who hastened to surround her, caused Don Filippo to turn round.
'Ah--so the trinity is complete!' he exclaimed, rising from his seat.
Andrea instantly slipped into it at Elena Muti's side.

As the subtle perfume of the violets reached him, he murmured-- 'These are not those of last night, are they ?' 'No,' she answered coldly.
In all her varying moods, changeful and caressing as the waves of the sea, there always lay a hidden menace of rebuff.