What is the name of this song?

I recently heard this song and the melody is stuck in my head, but I obviously cant sing it for you. The most I remember from the lyrics is the chorus which went something like: ive fallen fallen for youu-ooo-ooo and then some fast words that I never caught. The part I remember most about the song was the drawn out "you" - in case that stands out to someone also. Thank you for your help! I hope someone knows what im talking about!