My Ex girlfriend will not leave me alone to the point I feel harassed!!! Any help please ?

[Luke]

I was going out with a girl for about a year... We got on great but I was 23 she was (20) and she often would make me feel bad about seeing my friends, I was not allowed to holiday with them either...

Anyway we split up last year for three months. In that time I met someone else and had a few dates... When I got back with my ex I told her this. I got back with her as she promised to change and begged a lot.

We were together again for another few months but arguing continued and I realised she was not the one for me.... One night whilst having an argument on the phone I told her enough is enough and it's over.

She wanted to meet and talk about it... I didn't.

She went on and on texting, ringing, facebooking.... In the end I gave in and I drove to her house, dropped of her stuff and had a chat for 10 minutes or so, hugged goodbye and that...

The other girl I saw last time I broke up with my ex is my sisters friend, and is often round and we get on well...

My ex has it in her head that I left her for someone !!! We split up last November over 3 months ago and I have not had a girlfriend.

She has named about 4 girls in the past month that she thinks I'm with.

To this day I still get in excess of over 30 texts a day and numerous phone calls.

I ignore her completely. But her texts are full of bad language, she is threatening to get me beaten up, insulting other girls and family members, she has told me and text me evidence that she cheated on me, threatened to wreck my business... She also embarrassing has a naked photo of me which she claims she has posted on a social media site... And I can't take it any more.

I have spoke to O2 who say they cannot block numbers just change mine... But I can't as its my business number. I have it on thousands of business cards that have been distributed over the years.

I can't find an iPhone app that can block texts and calls...

Then there is the police. Will that just anger this crazy girl and make her do worse things?