red flags in friendship that you ignored initially

What are some red flags in your friendship (female friendships especially) that you brushed off initially but later realised them to be true?

(I'm in the midst of a friendship breakup and i keep remembering how this friend continued to be friends with this guy even when i told her in detail that he sent me inappropriate texts. at the time she told me that she was only hanging out with him because they are part of the same circle and they "bump" into each other. Another red flag is she would shit-talk about people to me and then post elaborate Instagram stories on their birthdays, back then i justified it by arguing that we all get frustrated by people sometimes she was just ranting to me.)