for the average person, the limerence phase -- where your brain produces dopamine instead of oxytocin when around your partner -- lasts around 20-26 months.
aka the honeymoon phase. wait until the dopamine hits stop and then see where you stand with that marriage...
searching "limerence dopamine" will get you basically all of the info you need. skip the first 6-8 obviously AI gen articles and hit wikipedia or some of the more reputable Medium writers. that said, chances are the first links, even if AI generated, will link to some sort of research.
aka the honeymoon phase. wait until the dopamine hits stop and then see where you stand with that marriage...