UPDATED Caught My Wife Doing It w/ My Best Friend Now Begs For A Second Chance.. Relationship Advice

I met my wife (we'll call her Sue) in college. We were both 18 at the time. We hit it off as soon as we went on our first date and were spewing I LOVE YOUs within weeks of us dating. She kinda pursued me, but I was glad as hell that she did. We shared our deepest insecurities and secrets with each other. And when her dad past away in her senior year of college, I was there for her through the whole ordeal. Her father had pancreatic cancer. And when he was hospitalized, I'd spend nights at the hospital with her so she wouldn't be alone. We got through it. And that point in time strengthened our bond. She told me she didn't know what she would have done if I hadn't been there for her. She called me her soulmate. I knew I was going to marry this girl, and sure enough, I popped the question about two years after we graduated. At that point in time, life couldn't get any better for me; I married the girl of my dreams, had a well paying job immediately after graduating, and both our families loved us.

My bestfriend, we'll call him Dave, and I had what I could only describe as an unbreakable brotherly bond, or so I thought. We had known each other since 3rd grade, and he was the brother I never had. He was also married, and moved away with his wife because she had landed a lucrative job at a big law firm. About a year ago, his wife died in a car crash, and this broke him.



STORY:
(UPDATE) My (27m) wife (27f) cheated on me with my best friend (26m)



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