Dh left his phone at home today. It rang, and I missed the call, so I opened it up and found he's been visiting those sites where you can hook up for no strings sex. Scrolling through the history, and it would appear that this isn't just a one off. Am absolutely stunned. Wondering what to do next. Obviously I'm going to tear a strip off him when he gets home, but what do I do then? He's going to try and wriggle out of it, I know. He has a history of lying about stuff, but never given me cause to think he would be unfaithful. Advice needed urgently.