Unvalued by your best friend?

Looks like the best friend status is not mutual. She may be your best friend but it doesn't look like she necessarily thinks of you as her best friend. She definitely takes your loyalty for granted. Maybe she doesn't even realize that her behavior is hurtful. Although I can somehow understand that she may want to talk to other people at times she should not let those people 'walk all over' you. You have three options. You can discuss this with her and see if she is willing to change her behavior. If not, you should look for another 'best' friend. You can still hang out with this girl as a regular friend though, if you so desire. Alternatively, you can skip the talk and look for another best friend immediately. Lastly, you can leave it at the status quo and not say anything. Personally, I would give the first option a try. If she is a true friend she will at least try to change her behavior. If she would laugh in my face or brush it off, I would look for friendship elsewhere as a 'best' friend should be concerned about my feelings.