It seemed like him.

She longed for an opportunity of talking with him and eliciting some explanation of his conduct.

There had been a time when he used to visit her, and always spent some time in her society when they met in the world--now, on the contrary, he seemed to avoid her whenever he could; and in proportion as she noticed that his manner cooled, her own jealousy against Corona d'Astrardente increased in force, until at last it seemed to absorb her love for Giovanni into itself and turn it into hate.
Love is a passion which, like certain powerful drugs, acts differently upon each different constitution of temper; love also acts more strongly when it is unreturned or thwarted than when it is mutual and uneventful.
If two persons love each other truly, and there is no obstacle to their union, it is probable that, without any violent emotion, their love will grow and become stronger by imperceptible degrees, without changing in its natural quality; but if thwarted by untoward circumstances, the passion, if true, attains suddenly to the dimensions which it would otherwise need years to reach.

It sometimes happens that the nature in which this unforeseen and abnormal development takes place is unable to bear the precocious growth; then, losing sight of its identity in the strange inward confusion of heart and mind which ensues, it is driven to madness, and, breaking every barrier, either attains its object at a single bound, or is shivered and ruined in dashing itself against the impenetrable wall of complete impossibility.

But again, in the last case, when love is wholly unreturned, it dies a natural death of atrophy, when it has existed in a person of common and average nature; or if the man or woman so afflicted be proud and of noble instincts, the passion becomes a kind of religion to the heart--sacred, and worthy to be guarded from the eyes of the world; or, finally, again, where it finds vanity the dominant characteristic of the being in whom it has grown, it draws a poisonous life from the unhealthy soil on which it is fed, and the tender seed of love shoots and puts forth evil leaves and blossoms, and grows to be a most venomous tree, which is the tree of hatred.
Donna Tullia was certainly a woman who belonged to the latter class of individuals.