Confused

Hey guys, so well, story time. This guy and I are really close. His fraternity and my sorority are “brothers and sisters” and we’re always together every weekend. Our friendship started out last year and well i knew he liked me, but i just wasn’t sure how I felt. This semester, I was super intoxicated and I ended up kissing him after he was talking about another girl. I then proceeded the next day to go for the other girl because I was so confused about how I was feeling. He is super nice to me and cares about my safety and me in general but why am I so confused? People ask me if I like him and the only answer I can say is “i don’t know”. It’s frustrating because I look at some other brothers in the frat and I think they’re attractive still and wish they’d talk to me, but I don’t want him talking to any random girl.. i really don’t know if it’s because i’m lonely or if I deep, down actually like him,

I guess moral of the story is, How can one know if they like someone or not? Why am I so confused in this situation?

(P.S. sorry this was so jumbled and just thrown together, it’s a 2am thought)