Yeah I sense that too. Usually you make one mistake and it'll make you **** yourself enough never to think of doing it again. Perhaps the OP felt crappy about it at that point. But she should have been honest with him then so this situation didn't happen. I hope she comes back to this thread because I want to know what she ends up doing.
Tell him the truth and tell him every detail so he can make up his own mind. It will help to relive you of your guilty conscience, maybe he will forgive you, maybe he won't but if you love or care for him you'll recognise that he deserves more than being kept in the dark about this. The fact it happened a long time ago is irrelevant, it still happened and he still deserves to know. You should tell him before more time goes by as your relationship could become more serious. I remember hearing about this a while ago, and you don't want something like this to happen! Courtesy of the 'Daily Fail' http://www.dailymail.co.uk/news/arti...years-ago.html