An EA (especially to a woman) is more important than a PA. There may have been something that the OM provided for her emotionally that she felt she wasn't getting from you. See if she'll tell you. Was it excitement? Validation? A boost to her self-esteem? etc.
Look at several books about affairs such as the "not just friends" book and DR and it'll give you an understanding of how important it is to address this.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.
