My ex (23M) and I (24F) have finally officially broken up after 4.5 years.

My ex and I finally officially broke up after 4.5 years. I knew it was going to happen at some point whether it was me building the strength to leave or otherwise. It was very toxic as I was in a mentally and financially abusive cycle with him. It was at the point where I was clearly being used for money for his debts or he’d leave, he just had no interest anymore. We’re were so emotionally seperated at this point. About a month ago he cut things off out of the blue. Turns out he had a new girlfriend a week after so obviously they had seen eachother before hand. I finally have left him alone after he told me to literally leave him alone. Over the past 2 weeks since I’ve stopped, he has called me every 1-3 days. I don’t answer. I don’t respond to his texts. He’ll text me “please answer emergency” or asking me how things are that I’ve done in my life recently. I know I shouldn’t try to understand why. But WHY is he texting me??? There’s no way this new girl (also has met his family) is aware. I refuse to ever answer him again because I’m tired of this cycle. It’s hurtful no matter how much I wanted it to work, it never did. I know if I answer he’ll ask me 1 small thing and hang up. It’s control. Why is he calling and texting?