How to spot a narcissist?

Talking to this guy who always asks if I'm thinking about him, says things like "you love me" and "you know you miss me" and just seems really self centered in a lot of ways. He will ask if I miss him but never says he misses me, asks if I'm thinking about him but doesn't say he thinks about me. What are some red flags for narcissistic behavior that you would look out for in a new relationship?