Help😬

Me and boyfriend walk to and from school every morning and afternoon. Since a little later last year, one of my friends has been walking from school with us. Some part of me thought that she liked my boyfriend but I’m not so sure now. I didn’t want to bring up the subject to him (my boyfriend) in case he didn’t mind. But this afternoon he told me he was annoyed too. I don’t know how to bring it up with her to not walk home with us or if me and my boyfriend be nice people and just let her walk home. I do value her as a friend, I just don’t want to walk home with her... am I just being bitchy or is this normal?