So I like my bestfriend but...?

Like a month ago she like sat up in my lap and told me she really likes me a lot. I took as I like you too, But yeah I really have a big crush on you.So I go on with life and this crush gets stronger. So we still chat but after that event she kind of cooled off. Well that doesn't help because she has me strung. She going through my mind like all the time. I still haven't told her that I'm bi or that I like her. but I really want too. I want to have a relationship deeper than the one we have. But is only coincidental that we go to the same church and her father is a minister and mine is a deacon and they are best friends. So our religious background says a lot for that. She doesn't really do that to people. Because she is one to tell someone to get off her in a heart beat. I'm lost dude