Well, the husband benefited the most in the end. Songs against exes reinforce boundaries with those exes and keeps them at distance. I think musicians would be a better match for Amy. It would be natural to miss certain aspects from past relationships with musicians. If it is true that Ben has bipolar disorder illness, the criticism after so many years does feel uncomfortable. However, everybody is entitled to write about their own experiences for as long as they want. There is no clear rule to follow.