Angry, hurt, or jealous...I can't decide.

I'm pretty upset but, as the title suggest, I can't decide if it's anger, hurt, or jealousy. As you know, this is the long, holiday weekend and I was wanting to do something fun. Life it too short to spend all your free time studying. So, I asked my friends if they wanted to do anything fun, even just dinner, but everyone, except one person, agreed that they could not even manage dinner. As I got to thinking about this, the more mad I got. I am so tired of being the person that gets left behind. Whether it's new relationships, new responsibilities, new friends, or just plain laziness, I am sick of being the person that tries to hold everything together while others simply pass me by. You can't tell me that you are going to spend every waking hour this weekend studying. Why can't we get together? Do they not want to hang out with ME? Am I the problem? If that's the case, that's fine, I'll find somewhere else to go. I don't need your pity. I'm just tired. I was dwelling on my hurt, anger, whatever last night and I realized that maybe I need to let this group go. Can life be lived without friends. Either someone doesn't want to hang out with this particular person or we don't want to do this or we don't have any money, whatever! At this point, I'm willing to try my hand at being alone for a while. I'm tired of being a third-wheel, I'm tired of being an afterthought, and I'm tired of being looked over. Because I am that person, I'll be there for them when life falls apart, the new wears off, or they're just tired of their "other" life. But right now, I'm done! I cannot and I refuse to be that person because I've got better things to do and I refuse to lose anymore sleep over it. So back to the original question, is it simply anger and hurt, or is it jealousy. It might be a little bit of all three.