Whore is sending my stepdaddy a video of herself masturbating on our couch

I've suspected my girlfriend is cheating on me with my stepdad but I never had proof until now. I filmed her masturbating on our couch while filming the whole thing. With one hand holding the phone and another fingering her pussy while occcasionally rubbing her itchy clits, she captures one hell of a view. She then sends the dirty clip to my perverted steddad and I feel like shit finding out!