Does doubt about the existence of a relationship between the wife and another person via phone, in the absence of material evidence and with both parties stating that they consider each other as brother and sister, justify recurring disputes?

Allah, the Almighty, says: "O you who have believed, avoid much [negative] assumption. Indeed, some assumption is sin. And do not spy," and the Messenger of Allah, peace and blessings be upon him, forbade seeking out the faults of people. It was said to Ibn Mas'ud regarding a man whose beard was dripping with wine, and he said: "Indeed, we have been forbidden from spying, but if something becomes apparent to us, we will act upon it." It is necessary to assume the best of one's family and avoid doubts, and to protect the home with religion and morals, where a person's own conscience is their monitor, so they do not do what displeases Allah. We also caution against the impermissibility of mixing between men and women without observing Islamic guidelines.