I caught my wife cheating with a friend of mine years ago and she said it was a big mistake?

She told me at that time that I didnt make her feel special and thats why she did it.after that she said to me that she would never do that again and she would never do anything to hurt me again.But every time we are out I always see her making every attempt she can to sneak a look at other guys that I guess she finds attractive. Now I know you could say its “just looking” but do the woman out there think that after what happened this is normal or is she always looking for someone else ? I know if she caught me I think I would never make her feel that I would do it again