Jack is not coy about the pronouns of her ex-partner the way she is about her current (or latest — forgive me if not totally up-to-date) one, because having previously dated a woman is on-brand (gay, queer, lesbian etc) but being in a heterosexual relationship is… well. Not very edgy at all. So lots of non-specifics about the boyfriend the way there weren’t about a previous girlfriend.
Lest there be any doubt, I mention this given I’m a lesbian myself and I’m used to people trying to seem very controversial by appropriating my space or lifestyle, and merely comment for finding Jack’s attempts to make herself interesting, very boring.