The point I was trying to make is that you were the one who kept initiating contact and chasing him when he had stopped responding and showed a clear lack of interest. This pattern repeated itself over and over. Worse, he treated you appallingly and you still stayed.

Yet, you were surprised when he told you he had something developing with someone else. He had made it very clear from the beginning that he was not interested. And at the first sign of abuse, you ought to have cut him off.