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The first two mean two different things. In the first sentence, the speaker is saying he is not going to withdraw his support from the person, that he is going to continue to support him or her. In the second sentence the speaker seems to be saying that he is not going to reveal the person's location to authorities. The other two sentences are identical in meaning.
I agree with Ron's comments, but would add that in number 2 you should say 'to give you up'. Also, it could have an alternatiive interprtation, based on the idea of surrendering. If you were in competition for a partner and were losing, yet not willing to admit defeat, you could say number 2 to express this. ;-)