Yet another disappointment

Am I that easy to cancel on? Do I have a sign on my forehead that says "spineless"? Why am I NEVER the priority -- the thing you absolutely can't cancel, the thing you have to schedule other events around? I feel so completely replaceable. You know that I don't have anyone else to hang out with here. NO ONE. You know that leaving me with two tickets to an event doesn't make up for the fact that you, last minute, made plans with someone else. So what that you only see this friend once every 6 months. I have friends I haven't seen in years. You should've said no because you already had plans. What is difficult to understand about that? It's common courtesy.