Interesting, although during one of her interviews with a radio station in the US recently, she had mentioned she has cheated before...

I don't remember which one though.... all i remember, someone correct me if I'm wrong, was that the radio host asked her who she cheated on and if she wrote the song for someone and she said that she wrote the song because she hasn't really heard the topic of cheating from women and she has friends and herself included who have cheated in the past.... she also mentioned that some of her ex's called her after hearing the song wondering if she wanted to get back or something.... please correct me if I'm wrong....

I would assume that the one she has cheated on would be Kiriya, although I am only assuming this because its the only relationship that I know she has had (even though she has a bf right now or so it's rumored right?)... and anything before her marriage to Kiriya she would be too young I think.

I'm guessing the station will ask kiriya if he was cheated on...