The song "Half Evil" by Gavin Haley is about moving on from a past relationship. The lyrics suggest that the other person in the relationship is trying to get back together, but the singer has moved on and has other dreams and priorities now. The phrase "half evil" could refer to the idea that both parties in the past relationship may have contributed to its downfall, but the singer is now focused on moving forward and leaving that behind. The overall message is one of empowerment and self-growth, as the singer asserts their independence and ability to overcome past emotions.