Yeah, she is not heterosexual she is NetorareSexual. I'm treating this manga as a morbid curiosity, I'm not expecting great writing, plot development or character development.
I think from the start Kuroko was using Gomi as a sort of safety net if her husband ever starts to "hate" her, so she at least has "a roof over her head". This could go two ways, Gomi's actions prove to her what love is or Gomi falls into the "Pitch-Black Dregs" with her.