According to these unhappy couples from Ask Reddit, some people do change after marriage.
48. She was a liar for attention. She tried telling me she was a twin, she wasn’t. It was just minor things that to me just seemed stupid. She would lie about how she used to train dogs (she used to be a groomers assistant). She talked about everything she had plans for and seemed relatively put together.
Once we got married her lying didn’t stop. Mainly when I asked “are you on tinder?”
49. “I’m so glad we are finally married so I don’t have to have sex with you anymore.”
50. I got sick for a few years and she told me “I didn’t sign up for this.” Should have broken up then. 
