My JW wife unscripturally divorced me, then committed adultery, was disfellowshipped, now she is trying to ?

marry the guy she committed adultery with. I offered to forgive her the first time that she committed adultery but she was unrepentant and kept on having ual relations with this guy. I see them together often, is it wrong for me to feel upset and at the same time feel a void from the loss of my ex wife? She really put me through the ringers with this horrid act of betrayal, but I do not want to hold any grudges, we all make mistakes, even terrible ones. Please advise....