Sorry to hear about what you went through. I do think it’s good that things ended relatively early though. Seems like you dodged a bullet in some ways.
I’ve been learning a lot about narcissism and his behaviour strongly reminds me of what a lot of narcissists do early in a relationship. It’s called love-bombing. I recommend learning about narcissism. He may or may not be a narcissist, but either way he sounds like he’s best avoided.