The mystery man - known only as MyLifeSuxNow - took to Reddit to open up about his wife's affair.
And, as the drama unfolded in real-time, he kept avid readers updated.
He began by writing: "My wife is cheating on me as evidenced by filthy text messages, I know but she doesn’t know that I do."
He went on to explain that he and his wife, who met when they were 22, have been happily married for eight years.
So happily married, in fact, that they had given each other the passwords to their phones and emails.
After he spotted a chance message from his brother, he decided to open up his wife's phone and fire off a funny reply to her - only to discover she'd been having a 'sexually explicit' conversation with a man named Zack.
He wrote: "I scroll up, and there are multiple nudes from both of them waiting for me to discover. Most of them are dated sometime between 1-4am (usually I’m sleeping then, smart.) so I knew she was obviously trying to hide it from me.
"She’s cheating on me. They talk about sex positions they want to try, how far Zack can shove his c*ck down her throat, and one short conversation about meeting up this weekend.
"I’ve erased all trace of me breaking into her phone. I don’t know what to do now. Jenny is cheating on me but we’ve had no major problems in the time we’ve been together.
"We still have sex 4-5 times a week and I make her c*m a couple times during each session; we still go out on dates and cuddle sometimes when we’re home. I don’t get it."
"I feel like someone has shot me in the stomach"
He added unhappily: "Should I tell her I know? Should we split and file divorce right away? Goddammit I loved her. I have screenshotted the texts and emailed them to myself.
"I feel like someone has shot me in the stomach."
After a string of supportive comments, the man - who revealed he has an infidelity clause in a prenup with his wife - returned to reveal that he had hired a private investigator and hired a divorce lawyer.
And he made sure to share live updates of everything the detective discovered whilst tailing his cheating wife.
He wrote: "Jenny met up at the front of a flathouse in a residential area and kissed a guy before she entered. It's Zack. Cheating confirmed.
"The PI is staking out Jenny and Zack's place. There will still be juicy updates if they leave the house I'm thinking so stay tuned I guess. I'm at a loss for words.
"The pleasure of our love lasted a few years, the pain that came of this will last a lifetime."
Finally, it appears as if the user confronted his wife, as he posted: "I can't type for more than a minute or two, but it isn't great. Yelling, anger, sadness, crying, a ton of crying, pleading, explaining, contradicting.
"The pleasure of our love lasted a few years, the pain that came of this will last a lifetime"
"This isn't a great place to be right now. I'll update when I'm at my buddy's house, it'll be a while.
"Sorry I couldn't update sooner. Nobody is hurt at all. You guys are having a great time reading I bet, this is the worst time of my life."
A staggering 15,000 people commented on the post before his last update which read: "Thank you all for the support these past few days, it has meant a lot to me.
"I'll post an update on what happens with the divorce lawyer."
Wowzer.
Do you think the man was right to go public with his wife's affair details?