He had just broken ____ with his girlfriend.请问这里填up还是off?

[口语](使)(人与人关系)发生破裂,断绝关系,关系破裂(或中断)；(使)(夫妇)离异：
例句：Their marriage broke up last month.
他们的婚姻关系上月破裂了.
to break up a friendship
中断友好关系
Jack and Jane broke up last week.
杰克和简上周断绝了个人关系.
断绝(关系),断绝友好关系,断交,绝交；解除(婚约等)：
例句：to break off relations with the neighbouring countries
与邻国断绝关系
如果比较不正式的东西,比较口语,就是UP.
比较正规,如果定婚了之类,就可以用OFF.