Societal pressure. It’s what’s expected and people who are shamed into it pretend to be happy. My parents knew each other for 3 months when they found out about me and my hypocritical grandma strangled my mother for it being out of wedlock and my dad’s parents were heavy Christians so they got married because what else could they do without getting cut off from any/all support
Technically. Divorced once, remarried for military benefits, stayed together “for the kids” and showed how unhappy they were the entire time, separated (but still live together) and a couple months ago my dad told me how trapped he felt in their marriage. Mom has screamed about their problems to me (as a minor) and asked if I didn’t want them together, I replied “I just want y’all to be happy”. I was neglected my entire childhood (now in my 30’s) and rarely speak to them unless someone dies.