Am I wrong

Am I wrong for getting upset that my best friend canceled plans with me that we made to go out with her boyfriend? I understand that significant others should always come first, but I still feel pretty wronged that she canceled plans she knew she had with me. She then told me that I need to get other friends because she can't always be there and that made me a little angry. I understand wanting to be with her boyfriend because they haven't seen each other much in the last month, but I have been there for her and told her to make plans with him and she refuses and says she shouldn't always have to do so. I just feel like I am always last in everyone's lives and no one cares if they have plans with me. If something better comes along they always cancel on me.