(...)
A music industry insider told Dish Nation,
“Rihanna is on strict orders from Jay not to mess with Chris. He laid down the law and warned her that there’ll be repercussions if she crosses the line. Jay, and especially Beyonce, are very close with Gwyneth and after Gwyn confessed that she and Chris are working on reuniting, Bey told Jay to have a talk with Rihanna.’
“Rihanna does whatever she damn well pleases most of the time, but Jay is the one person she respects. Even though
Rihanna thinks Chris is cute, she gave Jay her word that she’d behave. She’s dialed back the sexy too, wearing baggy pants and sweatshirts, and keeping their conversations strictly platonic and work-related.”
(...)
https://www.dishnation.com/jay-z-war...-chris-martin/
If Chris wanted to pursue something with her, he is making a conscious decision to do so (and the possibility of reconciling with Gwenyth is factored in to that decision).