I'm very confused.

Hi. I am a fourteen year old girl and I'm a freshmen in high school (if you couldn't tell from my age) When school first started I made a friend and she was so beautiful, but I'm dating one of her guy friends and he always make inapporite jokes and he is very loud sometimes. I'm probably going to sound like a jerk, but I don't like him anymore. I try to brake up with him, but the look on his face. It just broke my heart. I like another person, but I'm scared that I'll be hated by my boyfriend if I brake up with him. I want to date my gal friend too, but she is also very dirty and she had sex when she was 14. What should I do?