Considering how much she had done, and suffered, and sacrificed for his sake, it would be extreme and unjustifiable cruelty in him to forsake her now.

She never would survive such an abandonment.
Her whole soul was so wrapped up in him, that she would pine away and die if he were now to forsake her.
Antony was distressed and agitated beyond measure by the entanglements in which he found that he was involved.

His duty, his inclination perhaps, certainly his ambition, and every dictate of prudence and policy required that he should break away from these snares at once and go to meet Octavia.

But the spell that bound him was too mighty to be dissolved.

He yielded to Cleopatra's sorrows and tears.