I feel like, it's a different kind of world, where the only real positive male relationships Freya had were with her brother, to an extent, and a young boy, that her son tried to kill.
besides that, her son's dad was willing to treat his kids as fodder, her son, a dude who became psycho due to her overprotectiveness, and the dude who killed her son, a currently noble, formerly psycho god, who only came to kill her son because he cared for her as a friend.
plus, Kratos and Atreus suffered because of Baldur, and she carried a lot of guilt because of the gift/curse she put on him, yet they didn't blame her, so I feel it's really complicated for her, and she sees that despite all of the terrible things he's done, Kratos is trying to be a good person.
I prefer them as "friends", though - as close to a friend you can be to your son's killer, at least.
Don't you agree, Zach?
https://streamable.com/enq4r7