What to do? I really need help.?

[Ashleigh]

Me and my friend were planning to go see this band that I really like and then yesterday she cancelled and that really upset me. She knows how much I like them and I have spent all of today in tears. She hasn't even apologized yet for canceling on me, I've texted her and she ignored me but she could tweet? I don't know what to do since she is my best friend and she's so nice.
So my friend Jill knew I couldn't go and tweeted loads of pictures with them and her kissing my FAVOURITE. Shes put them everywhere - fb, twitter and instagram and I really hate seeing them. What do I do? I can't unfriend her because we're 'friends'.
They are two different friends.