To the OP;
Folks like Elliot Page are not suffering from indecision… it’s called revealing oneself in stages based personal safety / what society will allow…
Take Elton John for example; He once dated women and sang about women but he was really gay. Initially, he came out as “bisexual” because society was super-homophobic and being “Bi” still lent you some “Hetero Cred”.
However; When society became far more accepting of Gays, he fully came out, told the truth, revealed he was Gay and only was into men and even married a guy.
Then there’s Chaz Bono, who’s situation mirrors Page’s; Started life as a gal named “Chastity”, came out as “Lesbian” first only to later turn out to really be a heterosexual trans-man and renamed himself “Chaz”.
… It’s not being fickle. It’s survival, because of jerks like you.