OUT OF REACH.
Lux cursed multiple times when he couldn't contact Heart. He had been trying to call her for a while now, itching to have a conversation with her. He was damn excited because he had never had the chance earlier. Now was his opportunity to talk to her because Diana wasn't following him around, wanting to be in the same room whenever he was.
She was like a crazy dog that didn't want to leave its owner's side. Whenever he takes out his smartphone, her face immediately appears, peeking in.
It wasn't right, but he felt suffocated and unable to resist. She used her pregnancy as a weapon, and that was her way of getting what she wanted.