Do narcissists really believe their own delusions and lies?

I'm not even mad at my ex boyfriend anymore. What I'm about to post is actually worth laughing.

I had a stomach surgery in March 2019 to remove a benign tumor. My parents and I were fighting this ongoing battle (my platelets were elevated and my blood count was low) that was affecting my health and daily routine. I was bleeding somewhere and it took 4-5 years for another doctor to finally discover it.

My parents and I have been paying and looking for doctors like crazy. My parents and I paid for the surgery. The doctor and nurses did their job.

My narcissistic ex boyfriend claim taking all the credits to himself saying that he ''saved my life'' because he told me to eat all types of food and that he prayed to god that I get better. He kept saying I wouldn't be alive if it wasn't for him. All of the sudden he was the perfect guy and I owe him my life. Yet, he never searched for doctors, never called my parents and never contributed to paying any of my medical bills nor helped with my stomach surgery. LOL

Seriously, now I'm really laughing. Do narcissists really believe their own world, their own lies?

Updates
+1 y
He didn't give any credits to my parents and I actually searching for doctors, my father had to contact a couple of his friends who are doctors, didn't give any credits to the doctor who did the surgery nor the nurses. He only gave credits to himself, god and his praying.
He had money for other things (he paid for himself, for his good clothes, good shoes, etc) but not a dime for my health, my life.
Do narcissists really believe their own delusions and lies?
Post Opinion