wow, 19 years.
I've stood this game (marriage) for only 3.
Had a good relation with my exwife though.
She gave me permission to cheat, so not poly.
We never had children, some reasons to get married but the reasons didappeared and so did our marriage.
I never regret a day spent with her, and we split without much fighting.
Your birthday is the same day as mine.
Am a lot younger though.
Good luck in your journey to poly-happiness.,
Anton.