If you want to break up with your fiancé just do it. Don’t use some excuse to cheat on them - It just shows a lack of character. You will know it, your fiancé will likely eventually know it, and word will eventually get around. Show some character.

I get the want to physically draw a line under the current relationship to actually end it in your head but you'll have way more self respect and less stress during the break up if you wait 'till after it's over. The other problem with this logic is cheating is not the best foundation for a new relationship. Take the fact that you are actively fantasising about a loving relationship as the End of your current one. Deep breath, make a decent extraction plan for yourself and just get out with as little mess as possible. Then take at least 6 months on your own, maybe throw in some therapy to regain your equilibrium before looking for anything serious. Your future partner will love you more for dealing with this trolly load of emotional baggage *before* you settle down with them.

you should instead thinking of "breaking up".

Why wouldn't you do the decent thing and end it, instead of being a lying scumbag ?

Here's a crazy idea - dump your fiancee now while you still can. Trust me, it won't get any better. Don't wait until it's too late.

What happen to ppl being faithful ain’t even married but got the next one lined up SHOW SOME SELF CONTROL BE AN ADULT AND MAKE A DECISION!!! U either go thru with the I do’s and tell the next one u don’ts or Degrade ur self and ur current relationship by acting like a child

do not marry that woman. it won’t do any of you any good.