What helped me the most was to educate myself on narcissism. The more I learned about the specific behaviors, traits, and patterns of a narcissist, the more I was able to detach emotionally and not let the behaviors draw me in every time. He has been love bombing you to get you to stay, ie, hot pursuit. Getting other numbers to get a hold of you is stalking and harassing you.

My advice is to keep him blocked, and do not go back to him this time. Education can help you to break your own unhealthy pattern of returning and giving into him.