Eldin123

I am trying to find the name of a song. It was either the end of 2011 or start of 2012. A girl and a guy. The guy is wearing a kind of red flannel playing a guitar or maybe it was the girl I cannot remember. But I think she was playing a tambourine. They are talking about meeting cheating or something. They have English accents like Britain or Australian. Something like "I thought I saw you with .......". This is bothering me as it was a huge hit on every station but cannot find it anywhere