That sucks. I know that girls tell me all the time that I have pretty blue eyes, and that I'm baby cute. I know that in the last year, I've liked 5 girls, 2 treated me different and gave me funny looks, 1 I can't tell (we never talked unless I approached her), 1 I'm going to find out in the next week, and 1 never found out. So good luck, cuz I've had no luck at least becoming friends (Sure, one of the funny looks and the to be found out are older than me so I never had a chance) when they found out.
So basically, I'm doing bad when they find out. Just don't worry about it, and move on. Next time don't tell anyone you like this girl, hint it with the person, and also hint that you don't like them. Make them wonder.