Friends with benefits

I have these two friends of mine they are my best friends in the whole world, although ones a guy and ones a girl. We always used to talk about how gross and weird it would be if something happened and we became more then friends. Slowly I have noticed I haven’t been invited to thing, that they had been hanging out late at night and just ignoring me. People have been asking me about them daily but they hadn’t said anything to me. Last night I was so over it all and decided to ask if they were dating. They continued to tell me they weren’t dating they were just friends with benefits, I don’t know why but I am so upset we have been friends for 7 years! And now I feel betrayed am I crazy?!?