"Broken up" only works if the whole thing disintegrates or separates. "Classes have broken up" makes sense because all the students have gone their separate ways. "I have broken away from university" means only you have chosen to leave university and do your own thing. "I have broken off my university studies" means you ended your studies before you were meant to finish them; you didn't get a degree as a result. "I'm broken up from university" means you are a nervous wreck, due to the pressures of university.

这句中文怎么看怎么wierd

Broken up means 放手 :,)

"Broken up" has the meaning of “吹了”。I do not think that is the expression you want. You could just say your school has closed for the holiday.