He is jealous.

And, more than that, he has imparted his jealousy to others! In other words, he has made a scandal!" Low's eyes flashed.

"Where is your daughter now ?" he said sternly.
"At present in bed, suffering from a nervous attack brought on by these unjust suspicions.

She appreciates your anxiety, and, knowing that you could not see her, told me to give you this." He handed Low the ring and the letter.
The climax had been forced, and, it must be confessed, was by no means the one Mr.Wynn had fully arranged in his own inner consciousness.

He had intended to take an ostentatious leave of Low in the bar-room, deliver the letter with archness, and escape before a possible explosion.