the apparition

In this poem the speaker has issues! It is odd that he seems to say that if you cheat on me i will haunt you. But this woman has not done it and yet the speaker's "love is spent". Which i do not understand how one's love is able to spent when his love has not cheated on him yet. That is what made me think that this speaker was a stalker. He has unrequited love for a woman and vows to haunt her if she finds solace in another man. He speaks of haunting when he says she will wake up her lover who will think she wants something sexual and therefore returns to slumber. The speaker is almost making this scenario all up in his mind.