Yes, writing things out does help to sort out one’s thoughts and feelings.
I think the drive to prove they can make it on their own is a pretty common force. Another common factor is they live more moment to moment, like pay check to pay check. Not worrying or planning or looking too far into the future.
Also, this usually only last so long, a finite amount of time.
D
Feelings are fleeting. Be better, not bitter. Love the person, forgive the sin.