I'm in a relationship, 7 years and a little girl of 2. It's unhappy at the moment, lots of arguements and partner saying we are over and passive aggressive language. Last week an attractive single dad who I vaguely know (brothers friends brother) added me as friend on Facebook out of the blue. There's been an undercurrent of flirting, we have liked each other stories. I'm tempted to send him a friendly message. Please talk some sense into me so I don't!