I'd say, take your time. And listen to your guts, and your (true) friends.

Even narcissists can't keep up their own masks perfectly for very long; sooner or later the cracks show up. Something feels off.

In the meantime, be radically honest with yourself instead of fooling you into what you want to believe; usually your intuition will raise red flags.

And lastly, listen to your friends: things might be clearer from outside.

The main problem is, we're usually fooled by tricksters when we want to believe in something. That's why radical honesty with yourself is your best assurance.