I'm not going to help my friend get a job.
Is this because of something your friend did?
No, I just don't want to help him at all.
I think that's a selfish thing to do.  You shouldn't refuse to help a friend without a good reason to do so.  They may be unwilling to help you in the future.
I just don't care and I'm not going to help him.
That's no way to treat a friend. One of the duties of friendship is helping a friend when they need it. You shouldn't expect your friends to help you if you won't do the same for them.