the thing you have in your mind is the ones making you feel like that. just let go of the past and accept your wife as she is. it is getting harder to let go of the thought if you are still thinking about it over and over again. she is now your wife and she's not making anything to break the rules of your marriage. if you really love your wife, then accept everything and forget all the things that might hurt you. she's right that is was part of her past that doesn't need to be brought back again.