Every wonderful aspect of you can diminish when you are with a toxic person. They find ways to convince you that you are unworthy and unlovable so that you seek love and worth from them instead of looking anywhere else.
They use manipulation to keep you in a down state so that they can also be seen as the hero that brings you back up. The victim of emotional abuse experiences a “trauma bond” going through this up and down cycle, making it difficult to get out of the relationship.