That's how evil the heart of man is. Not everyone has an evil heart though, some are just evil naturally.
But every human has these evil tendencies in them. That's what results in jealousy, hate, and so on.
Seeing her ex-husband glowing, and living fine was making her jealous and wonder, that's evilness.
Plus the fact that he was on the news 'cause of a good deed he did, he stopped a person from committing suicide and even put effort into it. And due to this, he was going to become popular to an extent and receive massive respect.
The popularity wouldn't last forever though...but thinking about it was enough to add to the jealousy Layla was feeling.
..She wasn't just happy to see that her ex-husband was doing well.
"You can see that your ex-husband has become a hero. He stopped a man from committing suicide, that's huge". Bryn said to Layla, bringing her back to reality as her mind had already been clouded with thoughts.
