songwriters write their own songs based on their real life.
where do you think they get their inspiration from?

breaking up would be good for her happiness, if she's not happy.

i don't think there's love in the marriage, but she's trying to improve it (hikari lyrics) which i think to no avail(keep tryin), the lyrics stated she was lonely, which the two songs are a 4 year difference, which means the marriage is still on the rocks, and song artists doesn't like to reveal about their private life too.

and in you make me want to be a man, she's 21 at that time, and her thinking is very much mature too(why do you think she married huh).

and listen to keep tryin, in the part where she is riding the bicycle, the background vocals sang "tonight, tonight, i don't want to be lonely"(erith and her alien ears)... stick your ears close to the speakers to hear properly, it's not quite noticeable. you may need to download the original karaoke version, which is available in the song singing contest thread which i uploaded it there.