My husband found his live in girlfriend in bed with their builder. I'd say that's the worst way (yup, just like Sliding Doors...a great flick).
I suspected my first husband of having many affairs....caught him in one...and the final straw, well...caught him again. By caught, I mean his lies didn't work anymore, and I 'figured it out". Horrible, just horrible, because then I realized all the other times I suspected him of cheating, well, you get the picture. I wish, of course, he had been straight with me, respected me enough to tell me he was thinking of "going outside the marriage", but heck, if he was an honest man........
When I realized that I COULD CHOOSE to not be the victim waiting around for him to "treat me" however he would decide to treat me....well, that's when I took control of MY destiny and made the decision to divorce him.