Do I have a right to be mad?!?

Okay so me and my friends were all supposed to hang out yesterday, and I was with my friend (Morgan) and she was going to come too. Then my other friends texted me and said that we couldn't hang out because they weren't allowed. I was texting this guy and he told me that he and his friends were going over to hang out with the friends that cancelled on me. I confronted my friend and asked her what this was about and she said she cancelled kn me because none of the guys they were hanging with liked Morgan. But if they were real friends don't you think they would stand up for us and not ditch us because they don't like her? It made me so mad. Haha sorry if this us confusing/doesn't make sense.