I cheated on my wife with her best friend

I met her friend a few months after meeting my wife. When I met her, she didn't have a boyfriend, and later she started a relationship with a friend from her college days. When they started dating, the friend distanced herself from my wife and only went out and posted things with her boyfriend. My wife even commented on her disappointment and told me how she included her in our plans when she was single, etc. In the end, they got engaged (quite quickly after meeting) and my wife started seeing her more often, less than before, but they did see each other, and she would tell me how in love and excited she was about all the plans they had, that she had found her soulmate, and that they already had a wedding date. They got married, and, so as not to upset them, the guy, a few months later, cheated on her with a coworker.