OM is a co-worker who is at least 5 years younger than my wife, almost 10 years younger than me.
I should have known something was going on a couple of months before BD when my wife was very excited about the possibility of becoming a union representative, something she had never had any interest in. The OM is not a teacher, he's a technician, but he's the president of the school union.
My apologies to anyone who serves in a union position. I've done so myself and I know most people who do are dedicated volunteers but being union president is a perfect position for a narcissist like the OM. It sounds very prestigious, is relatively easy to achieve because very few people actually want to be union president, and it protects him from his bosses who I have been told all hate him. He was demoted at work a few years before BD and I've been told he would have been fired if he hadn't been union president. My wife also ended up being demoted about one year after BD.
My wife told me several times during our marriage that her coworkers would tell her how lucky she was to be married to me and how spoiled she was by me. At the time, she felt the same way. From what I hear, the OM doesn't spoil her, it seems to be the other way around. Makes me think maybe she really has found her true love.