i think i've fallen in love with my best friend

hello, i've been having a lot of issues understanding my emotions lately. my friend and i have been friends for a couple years now. no one has ever shown me the sort of love and care she shows me in my life before and i don't know, maybe i'm just having a bit of trouble differentiating between platonic and romantic love? i really don't know but i kinda think i'm falling in love with her but it's so confusing. it's like one day i'll be completely flustered by this woman and the other day there's no sort of feelings there. i really don't want to ruin what we have by confessing or anything but it's becoming too much. i've never been the jealous type but whenever she mentions her old crush who she seems to have been in love with, i can't help but to get this pain in my stomach. no one else i talk to ever makes me feel the way she does. lately, we haven't been talking much lately since we've both been very busy but i haven't been able to stop thinking of her. it's so confusing. i can't tell whether i'm just feeling lonely/bored or if i'm truly in love with her. does anyone have any advice on how i can get over/work out these emotions?