So i met this boy on a teenage dating app but no1 is ever serious on it and he came on and acted like i was the only girl in the world. He asked to start talking and i said yes thinking he wasnt being serious because we had only met and its never serious when u meet someone on it. I started going on call with him and he explained some of his health problems to me and that he doesnt sleep because of them. I dont like him that much but im trying to find an easy way to end it so i dont hurt him. I was really stupid and sent him nudes because he kept asking me and calling me dry if i didnt so i did. The more times i was on call with him he asked me to show more and more and i gave in and done it. He has seen every part of me and i regret it so much.he always tells me how much he loves me and how he wants to marry me and have children and stuff but were both only 15!!! He always wants me to stay up all night but i need to sleep and every time i say im going to sleep he gets angry and threatens to leave me but all that goes thru my head when he says that is that he has my nudes and will send them around therefore i beg him not to leave me. I really want to end it with him but im so scared that he screan shotted my nudes without me knowing and is going to send them around if i end it but he also keeps telling me that im the only reason hes alive and that if i was to end it he would end his life and i dont know what to do. Could someone please help and tell me what to do.