Me and this boy really like each other but theres one problem, hes an man whore. He slept over my house one night and the same night my friend slept over. and that was before we really liked each other...so my friend ended up giving him two hickeys and i forgave him for it cause were not like going out. and now hes going after my step sister. i filpped out on him and told him im pissed off at him. and hes still texting and flirting with her even after he told me he doesnt like her. and he even told me he said to her face that he didnt like her but i know hes lying. and i dont want him to break me and my step sisters relationship apart. and i dont want him to think i dont trust him, even though i really dont. so what should i do cause i considering just telling him to go with my step sister even though i really like him