You might think you're safe chatting about your private life in public - but the people of Twitter are always watching you.
Thinking he was safe on the train with his just mates, a man we only know as 'Ben' probably thought he was in the clear to open up about his cheating ways.
But Emily Shepherd was sharing his carriage.
The 23-year-old overheard his conversation and shared it on Twitter in the hope word would reach his partner.
Tens of thousands got involved in the hunt for 'cheating Ben' - including Deborah Meaden.
The Dragon's Den star was concerned for the non-cheating Bens travelling by train in the Bournemouth to Manchester direction that night.
Ben has not been found yet, at least publicly, but the search continues.