Blake said “She wouldn’t even be alive if it wasn’t for me.”
A friend said: “At first Blake refused to believe Amy had dumped him, but his initial devastation has been replaced by rage.
“He said Amy owes everything to him — he inspired her music and says he saved her life.
“As a result of Amy his life will never be the same and he wants to make her compensate him.
He has demanded £3million at the very least from her £10million fortune.”
Sources at Pentonville Prison said Fielder-Civil had gone back to his old druggie ways after The Sun revealed Amy had bedded her manager’s assistant Alex Haynes, 22.
Meanwhile Amy’s dad Mitch, 57, gave her new love his blessing yesterday after cutting short a Spanish holiday and flying home.
Mitch spent an hour with Amy and Alex at her mews home in Camden and was relieved to find her back on track after a wild boozy spree last week.
A source said yesterday: “In all honesty they think The Sun has done them a favour.
“It was getting harder to keep the affair under wraps.”