Oh! I know this one!!
When the groom was angry talking about the photos we were going to get and then at the engagement shoot couldn't be bothered to hug the bride-to-be or smile for any of the pictures.
Edit: Thank you all for your stories. I've had relationships where I've missed signs too.
People like this guy are tough to identify in relationships but of course there are 🚩🚩🚩. It turns out her girlfriends warned her; they saw him show no interest in helping prep for the wedding, not wanting to help with a location, go food tasting to find a caterer, and show a lack of interest in being a partner.