if you are going to tell a friend you have feelings for them you say that you like them but do not want that fact to come between your friendship.
I've done it twice but i was kinda lucky and they both returned the feeling. unfortunately they both said it on the same night... not pleasant. i was hated for about a week but then we talked it over and agreed that it was probably for the best as it might have ruined our friendship if we broke up. that was definately a desicion that i do not regret as i broke up with my gf and things just got real weird between us...
my advice never say you love them untill you've been together for about a month OR unless she says it to you first because that way you know that you are not putting too much pressure on her by saying it...
any who thats my advice no doubt that resolved your problem with this girl but just for future reference...