The heart wants what it wants fellas.
This is why you see so many divorces ending back in marriage.
In Ambers world no one comes close to her level of hotness and her state of being sexual. No amount of blowjobs from other women will be better than a blow job from her. She thinks she can show Johnny some love and affection and it will make him write off the millions she now owes him. She is a textbook narcissist.
It's not Johnny Depp that's the true Getbigger, it's Amber 
This is true.
Amber is also smart enough to continue to portray herself as a victim by making sure she everyone knows she still loves him. Despite the relationship being toxic for both of them poor Amber is the one who’s really suffering because she is hopelessly in love.
Great PR move.