I feel bad

So, this summer I was dating this guy. We're pretty young to be dating in general. And at one point he sent me a picture of himself and than texted:oh, lol didn't even see that, now that you already saw , should I send u another one on purpose?" Pause, 1) he's my principles son. 2)the picture was of his chest ok play: than I said, um, no it's ok. But he sent me one anyways, than asks me to send him a picture of myself. I guess I kinda felt uncomfortable but I'm not very touchy feely so I didn't tell anyone. Than he said that he wanted a picture of me so bad that he didn't care if I wasn't dressed. I know this kid well, and this isn't him, he is trying to act older than he is. He said not like this so idk what got into him. Anyways eventually we broke up, I told him not to tell anyone we were dating but he told a few people. Than today, I blurted out to my friend she all of this, they already knew we were dating just not the other part. One of my problems is that I'm too nice of a person sometimes. One of my friends defiantly took it the wrong way, and as soon as I told them I felt sooo bad. My friend kept making jokes about porn but I know that that's not him and it bothered my I guess. I told them I felt bad and that I shouldn't have told them but there responses were " but he told everyone that u guys were dating so it's ok" I said that two wrongs don't make a right but they kinda ignored me. I don't want ur answers to be that there bad friends becaus their not, there just confused. Anyways , i felt like crying, and I did when I got home, becaus I'm sure that he wouldn't want me telling people that and I did. I hate myself for telling my friends, even though I know that there not gonna tell anyone else. They said that it was his fault for acting that way , whitch might be true, but it's my fault for telling them. This boy thinks I still like him but I don't and it hard for us to talk. I wanna tell him what I did and I fell sooo bad. I really don't know what to do. Please help-sorry so long. Thx!