PETE DOHERTY is so besotted with Amy Winehouse he has urged her husband to leave her.

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The Babyshambles frontman has written a letter to Blake Fielder-Civil – who is currently on remand in Pentonville Prison – urging him to step aside.

A source said: “Pete has written to Blake and told him bluntly to do the decent thing. If he loves Amy, let her go.”

Pete – who, like Amy, is battling drug addictions – also told Blake he had proposed to Amy four years ago when they met on a TV show.

The snag with Doherty’s plan is that he’d lose his son if he hooked up with Amy. Lisa Moorish, the mother of Doherty’s son Astile, is dead set against the Rehab singer.

“Lisa won’t allow Astile to be with his dad if he’s hanging around with the wrong people or using drugs, and Amy is off limits because she’s still on them,” said a source.

“Lisa told Pete he has to choose between Amy and his son.”

But Pete believes he and Amy would be a happy couple now if Blake hadn’t got involved.

A source added to the Daily Star: “Pete explained in his letter to Blake that he genuinely believes if he and Amy had got together then, they would’ve weathered the storms of fame together and not have succumbed to addiction or depression.

“He thinks they’re two halves of the same coin, stronger together than apart. And he blames Blake for hurting Amy and getting her in this mess.”