I probably don't have to tell you that you are playing with fire. If you love your wife, you need to stop contact with this lady. It will not be easy but you will have to use what I call thought stopping. It consists of say stop everytime your mind goes down that path. I doubt you will be able to return to friends only at least for a while. I have but it is not easy and can take years. I have been through this. I totally understand where you are with your feelings. I didn't follow my own advice and lost my first marriage or 24 years. Unless you want to lose you marriage you need to stop it now. Good luck to you.