The narration in this is an excellent showcase to show people how you can write two different people's side of a story. You are really good at this for what I've seen of your poetry.
In my mind from what i have read there are two halves to the poem itself. The first half is about this person whom you loved and their point of view. A person who you let into your life and had a fear of. Your descriptions are wonderfully written because this person became an unwelcome guest in your life and they seem to have been a cold, almost spacey, unflinching person. It also feels like you blamed yourself for the person they became.
But the second half of the poem you woke up so to speak and you got away. It's almost like a retrospective of your past life. You realize that this person was not good for you and now that you have left you are starting to heal. But in that healing there is pain. The pain of moving on. I understand this poem all too well.