Why did my two bestfriends get so secrative all of a sudden?

Well, it could be mulitple things. One: they could just be getting along really well, and getting to know eachother since they just met. Two: If your birthday or something is coming up they may be planning something special. Three: As much as this probably isn’t what you want to hear they could be content with their friendship and are pushing you out of the group. My adivce: Maybe try to talk to them and start making other friends if you don’t have any just in case they are starting to reject you.

Are you sure you are not just being a bit sensitive? Sometimes when we introduce our best friends to each other, we may not expect them to hit it off so well. I WISH my two best friends got along, but I’m not so lucky. Just act like it doesn’t bother you. If they start acting like they don’t want to be bothered, or like they have anything but your best interest in mind, it may be time to go friend hunting!