Guy's Behavior

A weird guy I met added me on Facebook and got mad at me when I didn’t add him back. Should I give him a piece of my mind or leave it?

I work with this guy. I’m new at the job and was social and nice because that’s the kind of person I am, and he took it as me being into him. He gave me his phone and told me to add myself on Facebook so we could talk about our work schedules if we ever need to. He messaged me after our shift hardcore flirting and it made me uncomfortable, so I ignored his friend request. Apparently he disliked that because he cancelled his request and re-sent it two days in a row. It weirded me out because that seems obsessive so I just denied the request completely. Literally like two minutes after I did, he inboxed me, pretty upset. I thought that was even more creepy because that means he was stalking my profile. You don’t get notified when people deny your friend request.

So should I keep it classy and ignore it, or let him have it? Things are going to be weird at work regardless, and I want to stand up for myself because I don’t know this guy and I don’t owe him anything so for him to send me a nasty message ticks me off.
A weird guy I met added me on Facebook and got mad at me when I didn’t add him back. Should I give him a piece of my mind or leave it?
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