text: i wanna teach my bf a lesson for being such a cheater, what can i do? i've jst dscoverd that my bf is cheating on me... i want to teach him a lesson that he will never forget he mess with me.. a lesson that will kill his conscience.. people, what can i do? don't waste your time or energy being vindictive...just leave his ass...move on and enjoy your life...he's not worth it!!