Well, I don't think you should be upset over the fact that he turned you down and instead went and worked on your car. I know when I have things that need to be done and are nagging at my mind, I'm not so much in the mood either. You should be happy that he's working on your car for you though, that's nice of him.

What you should be upset about is the fact that he had no respect for the fact that you did not want to have sex and repeatedly told him so! Did you finally give in or did he force himself on you? This is worrisome.