Responses
If this follows the novel, he will pretend to cheat on her after she gets occupied with duties and pregnancy, wanting to get her attention back and she falls to the trap (She's on a really weak moment where any food makes her nauseous) and request divorce to the king because of her duties and promise of giving a heir to them... She finds out about the plan but she preferred it to be true than to know he was manipulating her...
It's everything I remember

She's pregnant and everything will go downhill from there, because Richard is stupid (if this follows the novel)