I Believe If She'll Cheat With You, She'll Cheat On You

My ex wife immediately started living with the guy she was banging when we married post divorce. I had to reach out for her to pick up somethings and she shared that the bf was convinced she was still doing me and she did not understand this. I laughed to which she declared her loved for him. I then said "you were fucking him when married to me what does he have your good word?" They married and he ended up ex husband #2