That's retarded! The police cannot do anything until he threatens her life.
I can see it now:
Her: Yes, hello, I'm OP, and I want to report a crime...
Police: Sure, go ahead.
Her: K, this guy said he wanted to date me, and when I said no: he wouldn't take no for an answer.
Police: Uhhhhhh.....Oh Kay? Has he threatened you? Has he physically assaulted you?
Her: Er...eh no?
Police: Click (and cue dial tone)
The end.