Losing abest friend?

Me And My Bestfirend Had a Recent Fight, This Happaned Because I was Talking To my other Friend Who is really close To me..And My Bestfriend Was sitting next to Me Then She left With OTHER friends..so I conintued Talking To My close Friend, When Lunch...

recently Ended I Went Up To her..She Looked At Me Witha B*tched Look AndI Walked Away, 2 days later we became Best Friends through Txt And When We Got BAck To School She Sat Me Down and told Me She Had a Suggestion, She Said So this doesent happen again why dont we have like days where we hang out jsut us two..then other days where we hang with our own friends, And Im Thinking thats a Great Idea And So I Agreed With Her... But while I was thinking about the Idea I Felt...Worried Because I Thought, Will I LOSE my Bestfriend? I Really Love Her Shes The Closest to My Heart Someone Who understandds..Im Scared If I Loose Her And My SOUL Sister...Do I Have The Right To Be Worried, Should I confront Her About How I feel.
HELP

It sounds to me like you are young, and I wouldnt worry about it if you guys are that close then you will have more fights, they way sisters do, but you will also fight harder to stay friends. If you want to tell her how you feel just be nice about it. Im sure it'll all work out.