What did I do wrong? How can I set it straight?

Me and my boyfriend had been together 11 months this month and had been very close since 2009. I see him as my best friend but he's very stubborn and independent. He lives alone where he works and I live an hour and a half away. He drives, I'm learning to. I see him every other weekend, sometimes not as often sometimes more often (depends how busy we are). I just spent this weekend round his house and I knew he was angry but didn't know why (there's no point talking to him about it, he just needs space). He didnt give me a single cuddle or kiss and then last night i was crying for a few hours and he ignored me. Then, he woke me up by trying to have sex with me. I didnt want it because 1) I wasn't in the mood and 2) I didn't want to because he hadn't been nice to me the whole weekend so I just wanted to cuddle and make up. He kept grabbing my hands really tight and I was trying to fight him off saying I didn't want it and every so often he gave up only to start trying again a few minutes later. I kept saying no and asking to cuddle to try sort things out but he wouldn't. We then fell asleep again and I woke up to him undressing me and I kept saying no until eventually I gave up because no one would have sex with someone they were really angry with.. But I was wrong. I thought him wanting sex meant he was feeling a bit better and so I let him but then asked for a cuddle afterwards but he wouldn't give me one still. Anyway, he dropped me off home today and sent me a text telling me to leave him alone because it wasn't going to work. He spent every penny he had putting fuel into his car to come see me. I offered to pay half and then in a month or so everything would change once I'd passed my test cos I'll pay a lot to see him too. He said it's not just money it's 'me'. I don't know what to do or what's going on? How can I get him back? I know people will tell me I'm better off without but I'm sure there's two sides to every story... I just don't know his. Help please?!