My boyfriend took another girl's side. What are your thoughts?

Anonymous
So, my boyfriend and I have been going out for almost four months now, but about a week ago we had arranged to go and see a movie in a group. When he asked the other people in the group whether or not I could tag along, everyone was okay with it except this one other girl. Now, me and this other girl have never had any problems before, I think I've spoken to her about two times? Anyway, she basically said that she didn't want me there, and if I did go, she was going to fight me. I didn't really care though, because I'm not scared of her. But my boyfriend actually ended up telling me that I straight up just shouldn't go. I'm not angry about it, just a little confused. When I told my friend, she said that he might have been taking this other girls side? What do you guys think?
My boyfriend took another girl's side. What are your thoughts?
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