First of all, don’t say you’re not that intelligent. It has nothing to do with that and we’re all intelligent enough to make our own opinion based on what we know to be true.
We know they’ve attended the same events, sometimes together, sometimes not. We know Gillian has been promoting The Crown. We know she’s linked to Netflix and so is PM. We know she acknowledged him in her book. And now, we know the publishing company of her book is tied up to his reps agency.
To me, the puzzle starts to take shape, and in my opinion, it looks more and more like a professional relationship. It looks like some publicist’s move to glamorize his image and seriousize (not a word, right?) hers by associating them and maybe making them work together. It looks like Gillian is going to be invested in his project, as an actress, producer, or writer. So I could be wrong, but after reading @gunningforabasementoffice ’s post, it just looks less and less like they’re a couple.