Threatening to put your photos on the internet if you don't talk to him is called extortion and it is illegal.
You say that you were very young when you posed for the photos. Were you under 18? If so, speak to the police NOW and have him charged with possessing child pornography. If he puts them online he can be charged with distribution of child pornography.
If you were over 18 when they were taken, talk to the police about your options. After looking online, some say it's legal and some say it's not....I have no idea. But if it is legal, you could possibly sue him for harassment. Or look at a 'cease and desist' order.
You may also want to investigate who legally owns those images.
Please, please go to the police. If you have evidence of his threats, take them with you.
Last edited by basilandthyme; 13-03-14 at 07:11 PM.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.