The distance between Donald and Jane is so real
Donald loves his daughter more than anything and is always there for her, but he never fully understands how addiction works like and doesn't know how to deal with it.
Jane cares about him to the point of stopping Jesse from hitting him even after relapsing and going to full "I'm ready to kill a kid if that means more heroin for me" mode, but still it's clear she feels like a disappointment and she constantly avoids her father.
Omg now I'm gonna cry I think