I didn’t mention this earlier in the post, but I remember quite well, in 8:10 Even was talking about Sonja and how she always tries to be in control of him, making it very clear that this is why he’d detached from her.
So, the kitchen scene in 10:10 triggered my senses. Since I’m doing this in order, that scene comes before my final-final thoughts.
Isak has spent the past week watching over Even, even involving his flatmates so he’d be constantly insured Even is doing good and he’s being watched. In the kitchen, he’s telling Even that he’s not getting any of the weed because it’s bad for him. These originally weren’t even Isak’s words, they were Sonja’s. Isak just straight-up assumed that Sonja was right and took it over into his own relationship with Sonja. He’s already showing controlling behaviour.