Did I really hurt him that bad?

Well I'm not really surprised that he won't talk to you and what do you mean by you don't like him. Do you think he's not boyfriend material or is it that you just dislike him because I sure that's what he thinks after you responded the way you did.
Really the only way to fix it is face to face if you can get him to talk to you, but what you are going to tell him I don't know. You've haven't given any reason to justify your actions and if you can't come up with one I don't see how you can fix things

I'm sorry to say that yes, you did hurt him badly. Turn the situation around. Say you really liked a guy, gathered up the courage to ask him out and he sends you that same message. What would your reaction be? It would really hurt badly, wouldn't it? The only way that you can fix this before it gets worse is to immediately go to him and say sorry. That doesn't mean that you suddenly have to confess your undying love to him in some Shakespearean moment, but just saying sorry. Say it like you mean it. I think he's got the message that you don't feel that way for him (like him in the same way as he does you), but he's probably thinking that you don't like him at all. Not even a little bit. His pride has been badly damaged by this, so I'm not going to say that everything is going to be okay from now on, but just that it will get better with time and playing nice.

Next up what you have to do is to watch how you treat him or other guys so that you don't have a repeat performance. You say that this guy is your protector and giant teddy bear that makes you smile. Be careful, because some guys might just take that to mean that you have feelings for them. Then when you don't accept advances, they just might think that you have been stringing them along. Just please be careful. Good luck with your friend, and I hope things work out well for you.

Wow I'd hate to say this but your a bitch. Now, if a girl said that to me, I would hate her guts. The only way to make it up to me would be if she came up to me, gave me a big hug and said something like, "I'm really sorry, I was dumb and wasn't thinking, I didn't consider your feelings. I can understand if you don't ever want to talk to me again, but can you be the better person here and find it in your heart to forgive me? " If a girl did all that, I'd forgive her on the spot and think nothing of what happened before.

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Before it gets bad?
Sounds like you really messed things up.

Tell him sorry. This is a case in which an apology will suffice. Don't say "sorry, I'll actually go out with you" because that will create a permanent rift between you two, but say instead "sorry I treated you like horse dung"

A simple apology can work wonders.