Tzuyu's not a jerk, really she isn't.
But if seeing Mina pouting for being jealous that she spends time with other people, then call her a jerk cause she finds feisty, sulky Mina the cutest.
It's gonna be 9, and I've been wanting to write Mitzu with a pouty Myoui by the side.
Basically, Tzuyu just hangs out with the other members while Mina, the actual girlfriend, is just pouty and whiny when Tzuyu just winks at her with a smile.
And no talk while she grumpily sat on the girl's lap.