Wow, main heroine is dumb as fuck. Not only is she the worst type of tsundere (the childhood friend that can't confess her feelings, gets jealous if some other girl beats her to the punch, and is always violent), she misunderstands everything, like how the fuck is he sleeping with women?
If you actually love him, you don't fucking do this shit. What kinda person suspects their own crush of shit instead of calmly talk?