Algorithm on shared wifi?

So my bf has allegedly been clean for over a month but he’s historically quite a liar about it and very convincing. His main source of porn was through instagram reels and thirst traps. He admitted that last week he nearly relapsed by searching on the twitter website for sexual content but stopped before he did anything. He swears he stopped there and hasn’t done anything other than that, but when I stay at his house and I use his wifi, my instagram reels are suddenly full of thirst traps and fake AI women. I know for a fact that I don’t consume this kind of content so it’s weird that it pops up for me when im at his only. Is it possible that the algorithm is shared through a wifi connection? Or am I just being paranoid and it’s a coincidence?