I Like this girl but i am slightly indecisive?

Well i like this girl you see, well her and i went on an official date, she even deemed it that name, I have a strong feeling she likes me, i like her and have for a long time, i just got over a serious relationship so i know i won't rebound. I have always had a thing for her, she sweet, nice, treats me well, and does things that i would only expect from someone who likes me, a freind of hers and mine told me he thinks she likes me, i slap myself for not asking why he thinks this, I've know her for a year, but i am a little unsure of what to do, i like her, but i am not 100% positive she likes me. What do i do? i like her ALOT. so i ask that you folk give me some Good advice and help a fellow out, your input with ideas for finding out, or just plain advice on the topic is much appreciated. Thanks! No BS please.