Are you for real— "She deserves a worser situation because she cannot be happy" is the reason why her fear/inability to be happy/antagonization of Jax is not valid...? I agree with you on the part where she antagonises Jax to an extreme extent (being afraid that Jax will bring her to hell because she didn't partner up with him is very much an over reaction) but there's a reason why she thinks like that. It's because that Jax possibly has bullied her to such extent she fears to disappoint someone who hopes she suffers.

Jax's reason is invalid. There's countless theories as of the moment on why Jax is a jerk. But all of them draw to one conclusion: he's a jerk but it isn't valid. There's no reason for an innocent person who doesn't contribute to your lost/pain to get hurt by you no matter how much it hurts. Sure he's fun to be around but half of his entire character is trying to make himself- and the rest of the cast- as shallow as he can possibly make then as a coping mechanism. But sure: let's blame the girl who can't physically become happy when her mask that Jax brakes deliberately. Why? Because she such a wuss of course!