They Begin To Like New Music Overnight
You have been with your partner for a long time and you know his or her musical taste pretty well by now. Overnight, something weird happens and they suddenly have a radical change of taste in music.
For example, if someone listened to rap music and they suddenly started listening to Latino music, know that it is possible that something is wrong there. Most likely they started listening to the same type of music that the person that they are having an affair with listens to, in order to be closer to them.
You know when a relationship is over: first they stop having sex, next they avoid telling you where they went and lastly they have a change in music taste and then you catch them having an affair with someone.