Depends.. on several things
#1 How much do I care about her? I've 'dated' plenty of girls for mostly sex who weren't
exactly significant enough to call significant others, some I cared about more than others. Relationship-wise, I think far enough in I'd say hell fucking no. Especially if I loved her
#2 How much is she making? If she's making an absolute fortune I think I'd be proud of her if anything lol. Even if she doesn't share said fortune and I still need to have a steady job
#3
And probably the most important one - Do I get to get in on the action, and essentially make porn videos with her for money (even if only occasionally)? Because that changes EVERYTHING. Even if she was a girlfriend whom I was in love with, then it becomes more than just sharing my woman with the world. And instead turns into a nice "public" - as in viewed by others - fetish (that can have actual public sex videos or any other kind of fun fetish), and may even serve to strengthen our relationship.. instead of making it weaker.
I already kind of tend to corrupt the girls I date into bringing out their most fun and deepest fetishes, and introducing them to new ones.. watch porn with them, etc. So something like this would be right up the same alley.
#4 Maybe a lesser one and unpopular opinion but - how hot is she? If she's unbelievably uniquely hot and Gods gift to men, then I may just feel the need to share her with the world for that reason alone.. because how could I not? It would be wrong to do to my fellow gender. But I've never had a girl
that hot (yet) soooo here's hoping