Remember that the sins of women reflect disgrace not only on their husbands, but also upon their children, whose honour suffers all the more because of their natural likeness to their mothers.
"Be well assured that, for my own part, I love my wife with all my heart; and should it be granted to me to punish the dishonourer of my house, I will do her no hurt; but, as long as Theodosius remains alive, I cannot condone her misconduct." On hearing these words Photius replied that he would do all that he could to aid his stepfather, but, at the same time, he feared that he himself might come to some harm by so doing; for he was unable to feel any confidence in Belisarius, because of his weakness of character, especially where his wife was concerned.

He dreaded the fate of Macedonia, and of many other victims.

For this reason he insisted that Belisarius should swear fidelity to him by the most sacred oaths known to Christians, and they bound themselves never to abandon each other, even at the cost of their lives.
For the present, they both agreed that it would be unwise to make any attempt; and they resolved to wait until Antonina had left Byzantium to join them, and Theodosius had returned to Ephesus, which would give Photius the opportunity of going thither and easily disposing of both Theodosius and his fortune.

They had just invaded the Persian territory with all their forces, and during this time the ruin of John of Cappadocia was accomplished at Byzantium, as I have told in the former books of my history.

I have there only been silent, through fear, on one point, that it was not by mere hazard that Antonina succeeded in deceiving John and his daughter, but by numerous oaths, sworn on all that Christians deem most holy, she made them believe that she intended to do them no harm.
After this, having risen greatly in favour with the Empress, she sent Theodosius to Ephesus, and herself, foreseeing no trouble, set out for the East.
Belisarius had just captured the fortress of Sisauranum, when he was told of his wife's arrival; whereupon he immediately ordered his army to turn back, disregarding the interests of the Empire for the sake of his private feelings.