I think I might like my best friend

Okay I am a girl and I am 15 my best friend and I were just talking one day and she was telling me about her old boyfriends and what they did normal girl talk then had her hand on my leg and I was like what are u doing and she was like oh nothing soo I didn't think anything of it the next time we hung out I was laying in her bed because we were having a sleep over then she layed down really close to me and was like moving closer and closer to me I felt different like I got turned on form it I was like why am I feeling like this she's my best friend then she put her hand on my leg again and I didn't say anything but then she started talking about how guys play games and move closer and closer but girls legs and I was like yeah I know how that is but then she did it I was like omg but I kinda liked it after that I told her I kinda liked her and she said she felt the same and she wanted to see if we both liked it soo I went along and she want to kiss and see where that went soo I was like okay I guess we could try she started talking drity and stuff and I got really turned on by it and in school she would touch my butt and like flirt but then out of know where she was like never mind I don't feel like that anymore I was like okay but really I started likeing her I mean she started all of this then stopped and now like her but she dosen't feel the same and ever sense then I have got turned on by girls but I have a boyfriend and I love guys but I also want to try things with girls but I have know one to try it with is this normal