I would like to say firstly that this is not a bashing post. I have never personally cheated and neither has my SO. There are just a lot of posts on here about a mistake one night and ending up cheating. Right what has happened has happened and no matter how guilty you feel it's not going to change. The only thing that I can stress is that you tell your partner. A) in the case of diseases and B) they deserve to know. Imagine this scenario, you've been in a relationship for 1 year and you cheat, you keep it to yourself and end up staying with them for 10 years. If they find out at 10 years when you've created a life together that's going to be a lot worse than in the first year of a relationship. You never know how your partner will react, he might accept it and move on but he/ she deserves the right to make that decision. I hope this makes sense to some people and for anyone going through this it helps. I also hope that no one sees this as bashing. I'm not condoning cheating but if it happens then you can't go back from it and it's all down to how you handle it from then. X