Oof
This story isn’t about breaking up with a significant other, it’s about being the odd one out of a group of junior high school friends. It’s a pretty sad story, so prepare a box of tissues. The OP went to her friend’s house for a slumber party, but then the mother came home and told everyone to get in the van, party’s canceled.
Everyone does, and the OP is dropped home first. She later came to find out that after they dropped her off, everyone returned to the house and continued the slumber party. That’s right, they just wanted to get rid of her for some inexplicable reason. Girls and their mothers can be so mean sometimes.