What is the relationship here?

i read that edgar really loves lydia in earl and fairy if so what is his realtionship with ermine. what does it mean when it says he will do anything for her on wiki ? was that before she died or even after he meets lydia. are they gunna be moments where i hate this love triangle and wanna stragnle ermine and edgar? i watched this anime before but cant really remeber it . also does anyone else think lydia is pretty. how is she protrayed appearance wise? i remeber ppl said she looks nothing like her mother who was beautiful but is that bc of her green eyes? and whats wrong with her hair its normal?