My ex might be a dangerous stalker? Plz read!?

[justme]

We broke up almost two months ago because he was cheating. When I found out and told the other woman about me, he started threatening to kill me and my family. He has continued to pursue me since then even though I keep telling him off. I did ignore him at first but he kept calling.

The other day someone made several fake ads on Craigs List and posted my cell number. People started calling and texting my phone nonstop. I had to change my number. I'm pretty sure it must be my ex because I'm not having problems with anyone else. Before that he also kept accusing me of emailing him that I'm pregnant, but it turned out to be a fake email that was almost exactly like mine.

Why is he doing this? Is he dangerous? He was abusive during our r/ship. He hit me sometimes and told me he would stalk me if we broke up and that he owns me, and that I'll never get away from him. He has been in jail for domestic violence before. Should I be afraid for my life?