Ex Boyfriend Keeps Contacting Me 🤷🏽‍♀️🤦🏽‍♀️😤

Okay So My Ex Boyfriend Of 5 Months Cheated On Me While We Was Together At The Beach For Senior Week & I Went & I Had A Feeling He Was Cheating On Me Because He Would Never Let Me Hold His Phone With No Hesitation. So The Other Day He Hit Me Up Saying That Can He Come & See Me & Have Sex & Be Friends. Like I Told Him That I Can't Be Friends With Him Since He Cheated On Me & I Don't Understand Why He Can't Go To His Girlfriend & Do It With Her . I'm In A Committed Relationship With Someone Who I Love But He Always Think It's Cool & Nice To Just Hit Me Up & Come Over My House Anytime He Want Too Just To Fuck . I'm Not Down With The Friends With Benefits ...& Plus The Girl He Cheated With Me On Don't Even Know He Been Texting Me , So Am I In The Wrong Or Is He In The Wrong? And Should I Let His Girlfriend Know?