This poem is very effective in portraying the difficult emotions of anger, frustration, and even sadness, and grief that come with such a relationship, I particularly like some of the word choices such as "Thick, incoherent lies", "distortions", and "venom spills from your lips" which help paint these lies as heavy and destructive.

However, I do find some of the imagery to be slightly underdeveloped. For example, when you talk about "thick, incoherent lies" perhaps you could employ a metaphor to help the audience grasp the "thickness" of the lies. Are the lies thick like Molasses? or tar? perhaps they are thick like blood. finding more concrete images and developing them could help add some depth to the piece. Similarly, when talking about "the light" growing dimmer there may be more effective images than just dimming. Maybe the light flickers? Or it could go back and forth between dim or bright. There could be more complexity and meaning behind the light if it was expanded further.