There are no guarantees. If you choose well though it is incredibly unlikely.
Filed under "no guarantee"
Humans are not naturally monogamous. The best a man can hope for is that his wife will bear his children, and even that is not guaranteed despite her promises.
Move to a desert island.
Relationships are best when they are built on trust. That takes faith in your partner. If you have not got it, you need to develop it or your relationship will fail.
relationship is just like pot of glass. no one can predict when it break. like that it doesn`t have any guarantee. we call him or her `part`ner as he or she can `part` ways anytime. anyway guarantee can be given if both are cheaters. cos whatever they do both do not fill it is cheating....... so cheating never happens.
In principle there's no guarantee.
However if you choose a partner who is not likely to cheat AND if you do your best and more to be their best choice, then it's very likely that they will not cheat.
In your pants.