"The Apparition" by: John Donne

When first reading "The Apparition," I was slightly confused. Through group discussion, I realized a few things. The speaker is speaking in the future tense. He is speaking to a girl who has not yet done anything wrong to him or left him. He tells her that when she does break his heart and leave him, her next lover will not be able to shield her from his "ghost." He says that "thee...in worse arms shall see." Through this phrase, he says that no man will be as good as he was and no man will understand her like he did. This seems to be a very emotional accusation for something that has not even yet happened. It seems to me that the speaker has experienced a relationship that ended badly sometime in his past and for this reason, he cannot trust anyone.