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The 25-year-old is allegedly furious at reports that his wife is sleeping with her manager's assistant Alex Haynes.
Fielder-Civil apparently believes he is owed £250,000 for every month he has been married to the singer.
A source told The Sun: "At first Blake refused to believe Amy had dumped him, but his initial devastation has been replaced by rage.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 £3 million at the very least from her £10 million fortune."
Fielder-Civil reportedly told friends that Winehouse "wouldn't even be alive" if it weren't for him.
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