I think you should warn the person if he/she keeps disturbing you, you will call the police and let them deal with it. But seriously, why is this person so childish? Have nothing better to do in their lives.
What a silly Biatch she is!! OMG, I feel so sorry that you have to go through all these, and being harassed by such a stupid person. I think she's just purely chi jor sin! And or she's jealous of you and your bf.