Girls, Why won't he leave me alone?

I posted here earlier but the guys replies were disgusting, so I wanted to post about this again.

The last couple of months a guy at work kept asking me to do something just me and him. I kept saying no and when he left on his last day he still just asked me to hang out with him.

I didn't say anything because I felt sorry for him cause it looked like he didn't have any friends.

I only told one person that I work with.

I deleted him from Facebook.

I didn't hear from him for 5 days then yesterday, Saturday morning at 12:15am he messages me saying:

"Oi, my name"

I didn't respond. He messaged me that night and asked if I wanted to catch up for a drink.

I then blocked him.

I know why he messaged me that early, so ignored him.

Even though he's gone, should I tell someone at work?

I didn't want to say anything cause his dad is also CEO in the company.

The dad is a nice person and I didn't want the dad to be embarrassed.

I'm stuck in a awkward situation.

I have kept the messages he sent me.

Should I now tell this someone?

I'm 38 and he's 23

Girls, Why won't he leave me alone?
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