Piece of shit?

All the people at my school hate me, i feel like not one single person is a true friend to me, and hardly any are even friends at all. Ive been with one guy for 3 years and we've gone through so much together and now he says i lied to him about asking a guy to hook up with me while we were broken up over the summer, and evidently i did, he saw the messages, and i losta so called friend, who went behind my back and told him everything i had said about him while we were broken up, and now she wont even talk to me because i supposedly asked her boyfriend to hook up with me. My boyfriend is making me feel so awful about all of this, and has even said some verrry harsh things that made me feel as if i could loose my whole life and be fine with it. I do not want to loose him, he's my life, the only love i ever want to have. i cant let him go, and he's trying to give me another chance, so i want to take it, but i cant do annnything to take back what i said nor can i appoligize enough for all of the things i have done to him!! any advice? at all? it would be very greatly appriciated.