hes threatening me..

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". I was a naive kid and it was a huge mistake. 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. Yesterday he sent me a message online that said something to the effect of "Remember that i have those pictures, and a picture is worth a thousand words"...What should i do? I'm really embarassed about this whole situation, but i want him to stop threatening me, and i want to be able to go through a day without being scared of him posting those pictures. Please please help me.

See your other post.