some random freak keeps messaging me on facebook?

[kate]

i added this guy on facebook after chatting to him on a dating site a few months ago. at 1st i thought he was ok but then i thought he's a bit of a loner and a weirdo. he kept pestering me to meet up with him and give him my number. he unfriended me after i told him i was seeing someone else. he can still message me from his facebook page even though we arent friends. he's messaging me saying 'meet me this week for the shift', 'number', and 'meet me' approx every 30 mins and wont stop. i havent responded to any of his messages. i logged on earlier this week and after 7 months he left me another message asking me out for dinner. i updated my cover photo and he must be creeping on my profile even im though it is private he commented on the picture. he keeps messaging me and inviting me out im not answering any of his messages. im worried if i block him things might get worse and he may create another profile and start messaging me again.