I feel horrible and depressed please help?

Well I'm 16 years old and I have this huge crush on this 18 year old adult. He just played me this week. He and I decided to send naked pictures with each other it was mutual. But then he said if I tell Anyone he will show it to people. I told my therapist which I feel horrible about. Then last night he came over to tutor me and we went to second. I mean that was mutual again. I mean I wanted it but now I feel disgusting. I regret it and he had to say last night that he doesn't like me at all:( should I tell my therapist about that too. I don't want to be a tattle tail but I have extreme emotional issues and I feel like cutting:/