There's a best friend of mine who is most imp to me in the world. I am to her too but she has other best friends too and recently i read her chats wid the other bff of hers that if smthing hpns in her lyf she wants to tell him first of all...she tells me too but i m feeling extremely bad...i can't forget it..i am always afraid of losing my importance a little or being valued lesser. I can't stop about that incident.i feel like crying.
I can really understand this feeling and I know how hard it can be to deal with. Could you maybe talk to her about it? Like, honestly tell her how you feel about the way that she acts. It'll probably be awkward, but if she's really your friend then she should understand. If she gets defensive or reacts badly, as hard as this sounds, it might be time to find other friends. I know from personal experience that continuing to put effort into a friendship that makes you feel crappy and where the other person doesn't value you as much as they should, isn't worth doing.
Don't give up what you want most for what you want now.