or take off a break, away from the affair AND your own, take a break far away, maybe couple hours drive to next town, hit the quiet upmarket bar, and have a good think, what you want, why did it happen? want to cut off, or carry on with you current one or is your affair teling you something else? i wouldnt say guilt, dont be so supersitious,, millions of people get into this situation EVERY DAY ALL over the WORLD...just take it was a chance to reflect and knock it off, if you know it was a stupid and not serious (but its Becomes way serious if you decided to be 'honest' to tell and expecting it all go away , IT WON'T... on other hand, if you can knock it off, and put down to your OWN experience (like got lucky, but realised it was dumb to cheat), then DONT say a word, and Don't meet that other one, Cut if off fast, and go back. Hopefully the other one wont bang on and try expose it all out of contempt. but that's the 'price' of the mistake - IF she(or he?)(dunno Your gender) couldnt care less either, then you're lucky pure and simple, and lastly if it Did gave you a fright (a bit or whatever - everyones have different scarability or staunchness) - the thing is, its a sign, that you're not built like Casanova and shouldnt do this again, so its not comfortable right? so its not a comfortable thing to do. so don't. Movies can deceive us to think we're will react in a certain way, not so. that's just my take on it 'after an affair , how I'd feel, i dunno never cheated. Dont really want to try either.