Advice and am I overreacting??

So my boyfriend of 2+ years, has a best friend that we’ve both known for a long time. I love his best friend, and kind of see him as a brother but every time that they’re around each other (which is almost every day) my boyfriend doesn’t text or Snapchat me back for 45+ minutes and doesn’t seem to want to talk to me when he does. This has been a problem before but I addressed it and it stopped for a while. I feel bad if I say anything because I do like his best friend, but I hate the feeling and how I get treated when he is with him. When he’s not around him everything fine. But it seems like when they’re together I’m pushed all the way out of the equation. Am I wrong for feeling like this?? What should I do?