Everyone thinks we're dating. Help?

So I recently went on a trip with this organization, and made a lot of new friends. I bonded a lot with this one boy, and everyone started to assumed we were dating. It got to the point that the others in the group kept telling him to ask me out, and I was pulled aside and asked if I liked him on numerous equations. I liked him- like a little brother. See, I dont swing that way and didn't feel comfortable coming out. I ended up being sort of cold to him the rest of the trip. Any advice on how to deal with situations like this?
Everyone thinks we're dating. Help?
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