Both the novel and 2008 film are very rereadable/rewatchable.
The way romantic relationships are presented is fascinating.
I've noticed that all the adult relationships are dysfunctional to some degree.
There is Lacke, an alcoholic, and his on-off girlfriend Virginia. They have drunken bust-ups.
There are Yvonne and Erik, Oskar's parents. Yvonne is a single mum who works nights, so she isn't around for Oskar half the time. Erik likes to drink too much, and sometimes prefers to drink with his buddy when his son visits.
Haakan's relationship with Eli is the most disturbing of the lot. Haakan is a paedophile. His relationship with Eli is not sexual, although Haakan probably wants it to be. He also lusts after young boys.
Pretty much the only romantic relationship in the novel that is 'normal' is the one that develops between Oskar and Eli. 🤣