She forgets to tell you she’ll be attending her 20th-year sorority reunion which is the same weekend as your anniversary.
You go on dates and she makes you sit in the back.
She introduces new things about her past you never knew about.
She displays new modes of dress and appearance.
She takes up new sports and hobbies.
You drive by a carnival to see her having fun with strangers.
You tell her you think it is best that you see new people, and she seems exceptionally happy with that idea.