Exes problem

So I’ve been dating my boyfriend for now 7 months he’s a wonderful guy and treats me wonderfully but recently his ex girlfriend who cheated on him starting messaging saying that she wanted to see him one last time to talk both of us tried to put a stop to it but she started saying if he didn’t see her she was going to my work and threatening me saying she was cause make my life a living hell I don’t know what to do or how to make her leave us alone I trust my boyfriend completely but this girl doesn’t know when to give up what should I do any advice ?