When to use to break up in Korean
Korean: 헤어지다[ he-eo-ji-da ]

When to use it
헤어지다 means to end a romantic relationship with someone. It is used when two people stop being a couple. Sometimes it can also mean to say goodbye and go separate ways, but here it usually means "to break up."
Example sentences
우리는 지난주에 헤어졌어요.
We broke up last week.
민수는 여자 친구와 헤어졌어요.
Minsu broke up with his girlfriend.
저는 어제 남자 친구와 헤어졌어요.
I broke up with my boyfriend yesterday.
수업 후에 지수는 남자 친구와 헤어졌다고 말했어요.
After class, Jisu said she broke up with her boyfriend.
우리는 공원에서 이야기하고 헤어졌어요.
We talked in the park and broke up.
여행 중에 자주 싸워서 결국 헤어졌어요.
We fought often during the trip, so we finally broke up.