What's that one "Oh my gosh, we're acting like a couple" moment with your best friend????

I'll go first- P.S - I'm a girl So there's this girl in my school. I've friends with her for 4 years now. We've gotten so close lately. Not just one moment but there are plenty of moments that scream "Oh, they're totally in a relationship". Cheek kisses, temple kisses, hand kisses, love bites on hands, little fights etc. One specific moment was a game of kiss, marry, kill. It was harmless at first. I didn’t give her my name with our other friends because I didn't want her to choose among us. But she gave me her name, including my two other best friends names, say X and Y. I sulked and then I said I would kill her, and selected among my other two options to kiss and marry. She was calm when I said I would kill her, but when I said I would marry "X", she was like -what's the difference between me and "X". I said some random shit. Later I asked her - kiss marry kill me, X and Y. She said kiss me, kill Y and marry X. I asked her what's the difference between me and Y, that made you kiss me and kill her. She didn’t answer. She said she can't answer "such type" of questions. Never knew what type. That day was full of tension. I said this is going somewhere. She said - what, is this not straight?? I was like yeah, I don't mind but just letting you know. She was like I don't mind either.