It sounds like your ex has some kind of maturity issue. Why would you care about his opinion? You should forget him slandering you, and forget what he said. He is just trying to drag you down. Guess what? Prove to yourself and everyone else that you are strong, mature, and confident by not falling for his trap. Eventually he will stop bagging you. People don't realize that they look like trash when they slander their family, or their ex. Don't buy into any of it.