I can't cope with the bullying, please help?

Here is some background information. I went out with a boy called Ollie in year 5. I thought I was in love (naive I know) but he only done it to 'shut me up'. He said I was the worst mistake of his life and that he hated me. I dumped him and moved on. I started going out with his best mate in year 6 for 2 and a half years, and during this time Ollie was surprisingly nice to me. However towards the end of year 7 Ollie and his mate Brad started hitting me, insulting me and making my school life a living hell. I eventually got them to stop and until now things were fine. A few months ago, Ollie came up to me at school and punched me in the head. He then walked away as if nothing had happened. I was shaking and his mates let it happen. They stood and laughed as I walked off in pain. When my friends arrived, Ollie stared at them and started making faces at them. I told my Dad and he reported it to the school and threatened to call the police. Ollie denied it and said I was lying. I stated that I had no reason to speak or have anything to do with him, so why would I lie? His friend Brad held his hands up and apologised. He then started slagging me off on the bus. He denied everything and spread rumours that I was a trouble making whore. This all started after me and Jaydon split up. The past few weeks have been hell. Since I have gotten with my new boyfriend, Brandon, the abuse has rocketed. Ollie was making disgusted noises at me and Brandon and kept saying 'Why Brandon, she's a skank' 'You're so gay for being with that'. Brandon doesn't care what negative things anyone has to say. He has reassured me that he loves me and that's all that matters. When Ollie threatened to assault me again, Brandon laughed and shook it off. He just lead me away and when I said Ollie was a dick, Brandon said loudly 'What? Ollie's a dick?!'. He done this because he doesn't know the full extent of what has happened, and me and Brandon joke around like that but I told him and he stopped laughing. Basically I can't put up with the comments, the violence, the abuse all together. It's ripping me up and is making me believe that I am worthless. Please, if any suggestions, let me know, The teachers never sort anything, and they can't stop him hurting me at break or lunch. The police is not an option, as it will make everyone hate me. Please, I can't go on.