Feeling Annoyed with Best Friend - Need Advice

I have been feeling annoyed towards my best friend(of 11 years) recently and I thought it was just bc to hang out with them all the time but I just got back from a vacation & I still don’t get excited when they ask to hangout. I don’t know why this is happening & I don’t like that it’s happening because I love them so much & they used to make me laugh & bring so much joy just a couple of months ago and we get each other so well. I’m not pulling away from all my friends either so I know it’s not depression-withdrawal from friends, it’s ONLY with my one best friend :(( has this happened to anyone else? What did u do?