I think the narrator became too career-focused and neglected her relationship with a guy. Her partner didn't cheat on her I don't think (otherwise the song wouldn't have such an apologetic tone) but he did become tired of her not being there and broke it off with her, moving onto someone who treated him better.
This song is basically her apologizing for her part in the break-up and asking him to remember the good times rather than the bad.
I think the narrator became too career-focused and neglected her relationship with a guy. Her partner didn't cheat on her I don't think (otherwise the song wouldn't have such an apologetic tone) but he did become tired of her not being there and broke it off with her, moving onto someone who treated him better.
This song is basically her apologizing for her part in the break-up and asking him to remember the good times rather than the bad.