"The Apparition" John Donne

So first of all I looked up apparition, and the dictionary.com definition is a supernatural appearance of a person or thing, esp. a ghost. The speaker is upset by the way that this woman has treated him in the past. It seems as though she has dumped him, and he is obviously not taking it well. He has died now and is now threatening to haunt this woman. I want to know how he died. There is not much evidence, but maybe he killed himself, because he couldn't take the heart ache. The last stanza is the creepiest, in my opinion. He says that he "will not tell thee now,/ Lest that preserve thee." In those lines, he is saying that he is not going to tell her when he is coming or what he is going to do. He wants to leave her in the dark, so that she has no way of preparing for it. The tone of this poem is quite vengeful. He wants to get back at her for breaking his heart.