Why is he being so mean to me for no reason?

im in 10th he is in 9th grade but were just friends. this boy who is my friend want to **** me but i dont let him i wait till marriageIM A VIRGINwhich is partly why he gets immature i guess. but he was talking to me about how when i leave ppl call me a slut and then he started to call me a slut because he thought it was funny. but the thing is i was already hurt about how others call me a slut. i asked hime to please stop in a nice tone he kept doing it so i hung up. i call him like 2 hours later cuz i want him to apologize but his jerky friend is on the phone...im nice to his friend no matter what btw i dont insult him and i try to be his friend he calls me and slut idk why. so i asked him to split the call so i could talk to hiim about what happened earlier because its personal and he is like omg this slut kept calling me a million times. i only called him once. and he is playing this gay *** zombie game and is more interested in it than the fact he hurt my feelings. ok you know what i play games i love video games i play it instead of getting ****** by tons of boys IM NOT A SLUT. my point is why is he being rude and how can i get him to talk to me