“One day you screaming you love me loud
The next day you're so cold
One day you're here, one day you're there, one day you care
You're so unfair”

Jay-Z – Holy Grail Lyrics on LyricsMode
EXPLANATION
This is saying how she's always changing her mind about the relationship and how she feels about her. Like she can't make up her mind whether she likes him or not. Or there could be another man in her life that's causing all these issues between them.