Well, congrats on your test!
Since it was you who wants nothing to do with your ex bf, just know that being happy and living well is the best revenge
.
Hope this mood passes....maybe it's almost time for your period? That's how I always got just before mine.
And I guess maybe your girlfriend is just self centered. That was a crummy thing for her to do. Maybe she's jealous of you. Even if I had stuff I didnt' use, I'd still come just for the party, and to hang out with friends. I'd just do my own thing and let her do hers.