Thabo, 25, says, "On New Year's Eve I went clubbing with my now ex-girlfriend and some friends. Soon after midnight, she said she was tired and a friend offered to take her home since he'd kept off the booze. Little did I know, they continued to have a private party at his place. I didn't know who to be angrier with – my friend or my cheating girlfriend."

A similar double betrayal happened to Carole who says, "A former best friend helped herself to my boyfriend. I was crushed and stopped seeing them both but with hindsight I realise that as friends, we had similar tastes in everything from clothes to music to men, so we were bound to be attracted to the same type."

Marriage counsellor Jeanine Errera says, "It's easy to fall for a work colleague: you only see your spouse early in the morning and at night time and the rest of the day is spent in the company of other people. So it's convenient to find an emotional – or sexual outlet there."

Errera says, "People tend to think that physical contact is necessary, but one can be unfaithful on different levels: sexually or emotionally. The content is often sexual and many boundaries are transgressed. Further, there is curiosity... wanting to put a face to the writing."

Primrose, 30, tells her story. "When I met my boyfriend, he was married but unhappy. He's divorced now and we are still together after six years, so although he was cheating in the beginning, his marriage was never meant to last." Although Primrose's story has a happy ending, Joanne warns, "If a guy is cheating on his girlfriend with you, chances are if you start dating him, he will do the same to you."

And those are the basic Cheat Street scenarios. Got another to add? Or simply an infidelity story to share? Please do so below...