Blackmail. Please help!

Without sharing too much personal information, i really need legal advice. When I was a minor, (15-17 years old), i was dating a guy 3 years older than me. During our relationship, I sent him pictures that could be considered "inappropriate". They were intended for his eyes only. When we broke up, he threatened to put the pictures online, and then proceeded to do so. To my knowledge, he removed them later on. However, he swore he had lost all of this pictures, but has recently been emailing them back to me with comments about them. I'm scared he's going to somehow use them to blackmail me or put them online again. Is there anything i can do? Please please help me.

You can report him to the police if it comes to that. It is illegal for him to blackmail you and it is illegal for him to publish those photos, anywhere.