He Cheated

I'm pretty much fed up with his lies, he used that whisper app, and I thought the last few days he had done well nope...he downloaded the app and deleted it before I seen....is it horrible of me to want to find a random chick and have her come over to have sex with him? Is it bad that I'd rather serve her ass up on a platter so he will stop looking? I'm tired of being hurt. A 7 month old son together and another on the way this is killing me.