A casually dressed young blond woman is looking away sadly as couple near her are kissing.
A woman looks away after recognizing her ex-boyfriend kissing his new girl.
One cannot infer that the couple kissing would be her ex-boyfriend and his new girl, they could have been entirely different people.
It is not necessary the cause of sadness is her ex-boyfriend
Just because a woman is looking away sadly as a couple are kissing it does not mean she recognizes her ex-boyfriend kissing his new girl.