It's been months since you broke up with her...and you've been trying to move on, but it's not easy. She was everything you could have wanted in a girlfriend, but she was also incredibly complicated and unpredictable. You're enjoying your single life, going out with a new girl...she finds out about it and blocks your way to a class, she says...

"You are not dating another girl, forget it."

she says in a demanding tone crossing her arms looking up at you, she's jealous and angry with you.