I too adore grapefruit and also take a statin. ( Simvastatin max dosage)
Under docs advice I drink no more than a litre of grapefruit a month and so far no evil effects.
However, I was once treated with Erythromycin and was not asked whether I was taking a statin. Within two weeks I started suffering muscle weakness in my long muscles. Imagine that one leg can no longer support your weight! You can’t climb out of a car or climb up ladders without heavily using your arms to yank yourself up.
After a little self research I realised that I may be starting rhabdomyolysis and stopped the Erythromycin and headed straight to my regular GP.
She immediately recognised the symptoms and agreed I should stop the antibiotic. It uses the same enzyme to for metabolising as the statin ( and grapefruit)
It took me over 6 months to regain the strength in my leg muscles. She advised that one litre of grapefruit per month should be okay but take the statin at night and grapefruit 12 hours later.
Overdosing on statins accidentally is not a pleasant experience.