Law and you were allies for years, he trusted you and you knew everything about him, Law and you were like best friends

That is untill, he noticed something strange with your behavior over the past years, you were always secretive and always happy, you always had a smile on your face, it was strange...

At Dressrosa, you were captured by Doflamingo, he freed you but you told Doflamingo about his position, thus the fight on the bridge

He then gets captured and is locked up, he notices you and gets mad

"YOU... OF ALL PEOPLE HAD TO BETRAY ME?!" He was obviously and visibly mad