We may never know what the music is trying to evoke in us unless we listen to what is true in the sound of the moment. It is unfortunate to see how much beautiful music is unappreciated because it does not fit a particular form. Not to mention how many missed opportunities occur because we get so fixated on making a potential flamenco into the theme song to the Waltons. Then there is that forever thing, that rule that we should be in love with only one person forever. It's possible but rather unlikely.
People change over a measure of time .
Someone's heart may open and so their chakra configuration also - the result being, they change their tune. Their partner may also have changed, for the better also. But combined, and without any fault, their tunes may sound unbearably dystonic. Consider what happens when we force ourselves to stay in a situation where there is persistent disharmony. I'm not saying the relationship is over at the first flat note.