I Need Advice

Okay, so, I have a best friend and a year or so ago, he came out to me and said he was bisexual. He told me really, honestly, not to tell anyone. I kept the promise, but I ride at a barn, and the girls there were teasing me about him liking me. So, I told them that he wasn't interested in me, especially because he felt attraction to guys as well. I thought it was okay, since it sort of got them off my back. Now, there's a horse show coming up in 3 days, and he and his family are coming to the show. As much as I can try, I don't think I can keep my friend and the other barn girls separated. I'm really afraid that they'll talk to him and tell him that I told them this stuff... when maybe I really shouldn't have. The guilt has been sort of eating me alive, and I'm getting mini-panic attacks over it. I don't have a legit excuse to say that he and his family can't come to the show, and they're coming to support me. I'm really worried that he'll get mad at me and stop being friends with me... I would understand it if he did, I just really don't want to lose him. What do you think I should do?