What do I say to him?

Okay so I have this friend of whom I had a crush on, hes a junior, im a freshman (in high school) well turns out that he actually likes me, and when I found that out, I all of a sudden dont like him anymore. is that weird? well hes going to ask me out...

reall soon, today actually, and I don't know what to say cus I liked him untill he liked me. I do want to stay friends with him but the line "I like you a lot, but as a friend" sounds so fake and overlyused. and its not like I can avoid him or anything cus we sit next to each ohter in classes and hes in a play that im in and I dont want anything to be awkward. any help???

I think you might just be scared or nervous. Talk to him, see what he has to say, then go from there.