Let’s not forget that at this point, Isak doesn’t even know where he stands in Even’s life. Just a day ago, he had resigned to the belief that him and Even are over. This is not him defending Even because he is his lover. Or because he has to defend him out of any sort of obligation. He does not even know if they’ll ever even talk anymore.
This is him defending Even because he genuinely believes that Even is a good person. He genuinely feels that he does not deserve to be talked about behind his back. He is standing up for him because he knows that he deserves better. This is not out of any selfish motive.
Isak genuinely respects and cares for Even, and nothing anyone says can change that anymore. And I am so proud of how far he has come.