How to deal with a boyfriend's ex who keeps messaging and calling him?

Anonymous
We've been dating for a month and there wasn't a huge gap between the two relationships. I've known him for over two years and we didn't start talking more until recently. Anyways. She keeps calling him and leaving voicemails that were first her trying to get him back, telling him to leave me when she found out we were dating/that he downgraded, and now leaving voicemails about me since she found me on Facebook. I'm more than likely going to block her but I've never been in this kind of situation before. I don't know if it would be appropriate to try talking to her and asking her to stop in the nicest way possible.
How to deal with a boyfriend's ex who keeps messaging and calling him?
6 Opinion