I know talking about someone's sexuality is a tad frowned upon, yet I have to say I think Jack is bisexual (been thinking this for a while). Nothing wrong with being bi, I consider myself bi for the record. Jack wants to fit into a clique, she wants it so badly, and the whole coming out at pride thing is great, but I think it's only half her story and was done to get Jack into a niche.
She's had relationships with men, conceived a child, lusts over men openly, she was flirting all over the shop on DKL with male guests more than female ones, and I'm calling bi (but ashamed for some reason) Love is love Jack! It's the LGBTQ community. If you like either or, that's ok!!!
Just personal opinion on evidence provided, m'lud.