If your supposed best friend got a new best friend would you start distancing yourself from them?

Just look for the signs. Is he inviting you out a lot less than he used to? Does it seems he now spends way more time with them? If so then i'm sorry but you know your answer. I had a best friend completely halt all contact with me for a month and each time I checked in on her, she was out with her new bestie. I distanced myself from them and they didn't notice and I would do it again. These kinds of situations are tragic.