You will be surprised how much confidence and sense of security you will have restored into you when you have a real relationship partner.
What you are going to have to be careful going forward is you cannot project what your wife did to you onto the new lady. Your projection can cause her to lose trust, and then the relationship gets out of wack like it is today.
You don't have trust with her.
Marriage is a partnership.
Marriage is a trust.
Among other things.
As coach says, if she is unworthy of trust today and is comfortable with her actions - why should she change?