I had a similar situation happen at my coffee shop. I was perky, nice non-confrontational and worst of all, an attractive young female.
Creepy man in his late 50's or early 60's who dressed like a hipster would come in. I like my job most of the time, I like for people to feel welcomed.... I REALLY like for people to tip.
Well... this man started bringing me presents, cheap tarnished necklaces from thrift stores, toy cars... weird shit.
Unless you've been in that situation you have no idea how scary it is.
This man's mental state seemed like it was becoming more and more deranged. There were code words for having me hide in the back room until he left.
Then he started touching himself while he watched me make drinks... and shit hit the fucking fan.
I called the cops and had his ass trespassed and arrested. The guy was a registered fucking sexual offender and a schizophrenic.