The scene in Eternal Sunshine where Jim Carrey’s literally inside his own head trying to erase someone while another part of him desperately holds on, that captures something real about trying to disconnect from someone.
We literally just had a thread on cord cutting which is pretty much this. You end up more tangled up the harder you try to forget. Been noticing how certain films show these intense connections through weird metaphors instead of straight romance. This analysis I found gets into it.
Psychological thrillers and sci-fi seem to nail the feeling better than love stories. Probably because having someone that deep in your head feels more like a mindfuck than anything romantic.