It's a poem, so I won't analyze it for you. It's like a joke; if you have to explain it, it's not any good. I leave it up to you to apply your own interpretation.
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Really? Only a vampire can love you forever? Does that mean your mommy and daddy don't? Not God, not Jesus, not Mohammed, nobody but a blood-sucking vampire? Did your boyfriend dump you and now ordinary isn't good enough? Feeling under-appreciated and hoping a vampire will see what nobody else sees, that you, like Bella, are really, really special? Are you hearing how pathetic this sounds? Wake up, get real, get over whatever it is you need to get over and return to the land of the living!