Y&R: Why did Sharon have Sex with Sam and cheat on poor Adam?

Sharon is a whore. So much for loving Adam!, The man who sees her as
this Light inside his darkness world, believing she will save him from
himself and turn him into a new person lol. Now he's trying to clear
her name for what? So she can open her legs to next man in Bed.. Can
you believe Sharon Newman had SEX WITH SAM!!!

Do you think Sharon should tell poor Adam about this?Awww another
person who he loves hurts him ):