...so did they break up or did they not?
they probally just in a vague relationship, you know, the classic shoujo like where the senpai are like a womanizer while the girl play the role of the navie girl, who get fooled and get abandoned. But the womanzier love interest actually in love with her for real but just "not express well" or the like. And later she will come around and make up with her.
Remember when they first appareacne is likely "the morning after", she just pack her thing up and gone with no word whatsoever. Then the girl told this to her friend for advise and friend say that senpai just toying with her which she can't not find any way deny that and in tear.
Now go back to this moment, right now she still kinda self pety and give the senpai nice words. probally because it was never said so she can't really say they break up, or if they even in a relationship to begin with.