Online Dating:Omg People who tried Online Dating??!?!?!?!?

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This is my first time trying online dating. and i am talking to this one guy and we were fine. one day he asked me if he can add me on facebook but i told him my fb is deactivated. he replied back saying Him: "oh i was going to see if you wanted to ad so i can verify you're not a serial killer
Me: lol was that a joke?
Him:maybe Well ive had experiences with people not looking very similar to their match photos. that's why i ask
Me:Oh well i look like my pictures.that's why people meet in public places so they can escape
Him: lol k

He thinks i am beautiful and funny...but out of the blue he asked me this question. does he think i am too good to be true?