Well I mean there was no way she could infiltrate DYAD and still be with Cosima because she even says something about how she needs to severe attachments or whatever. And if she didn’t infiltrate DYAD, then the clones would be pretty much fucked over because people would just be trying to kill them, and I mean the point of a TV show is the plot, and this plot involves the safety of the 4 main characters so yeah I think it’s pretty important and pretty necessary for them to breakup.
And honestly I think this shady Delphine is 100% in character. I mean she was shady to begin that, we saw that in season 1 when she sells out the clones to Leekie, and again in season 2 when she gave over Cosima’s blood sample. And now she feels personally attacked by Rachel, not to mention there was a plot to kill the woman she loves. I honestly was expecting Delphine to kill Rachel right then and there.
Delphine is not afraid to cross moral boundaries to get the things she wants. She slept with Leekie to get the career she wanted, she sold out Cosima for said career, then she betrayed Cosima multiple times to ensure she got the best care for her health, and now she needs to do whatever it takes to keep Cosima and the clones safe, even if that means torturing the woman who wronged her. It’s 100% in character for Delphine, and I think we are going to be seeing a lot more of this side of her this season!!!