A made-up word used by people or organizations who need to check nondiscrimination boxes in order to sound appropriately enlightened and informed. Gender orientation is a mash-up of gender identity and sexual orientation, neither of which have any correlation to the other.
Alex realizes that he has developed strong feelings of love towards Sam. Alex is unsure of Sam's biological sex. Alex was straight , but now he doesn't know what he is. He is now in a gender-orientation conundrum.