I have a feeling the guy I hate likes me but he is really sensitive. How do I tell him I don't like him?

As it stands, honesty is better than any other method when it comes to communication. Based on your explanation, there would never be a workaround if someone gets mad at every little thing. All you can do is tell him outright and stand behind your claim. You should never have to work around something like this when you are trying to end a relationship. If the person you are telling gets angry, you have the obligation to walk away and never look back. In a perfect situation, there would be an actual solution, but all you can do is tell them the truth and negate any negative emotions they would throw back at you.