Salam Claudia, أم أنني وقتها شعرت أن مجرد ارتباطه بامرأة يُعد خيانة لزوجته: .... Or that I felt at the time that his mere connection with a woman/ attachment to a woman is considered a betrayal to his wife. "ارتباط: connection/ attachment" here doesn't mean a betrayal in a full meaning, so it could be a love letter that the husband wrote to another woman, or just admiring her or having a crush on her.

Hello Claudia, translation is: Or that time I felt once that his association with a woman is a betrayal of his wife.

or did i felt at that time that just his attachment with a woman considered as cheating to his wife