The Feud Pyramid

Two weeks ago, I finally dumped my totally abusive jerk of a boyfriend. I do miss him, but I know I made the right decision. I came to see that he was cruel, manipulative, sociopathic, and toxic. However, I stupidly went on Facebook and saw that he already has a new girlfriend! I'm so pissed that I was replaced so quickly. I do not want him back, but��I do want to make him suffer, basically to get revenge for all he put me through. My friend keeps telling me revenge is unhealthy and toxic and...