The 'Back to Black' singer's dad is furious that she and her ex-husband are taking steps to get their relationship back on track and believes their renewed union will spell trouble for their current drug-free lives.
He told Closer magazine: "It's a possibility that they could get back together permanently because she loves him, so what can I do? But I'd be devastated, I'm worried about the situation and I'm going to discourage her in every way I can. Their relationship was a disaster, it was destructive and they're lucky that one of them didn't die. Two addicts can't be in a relationship."
Last month, Amy was charged over a drunken incident at a theatre which saw her hurl abuse at the cast of 'Cinderella' and allegedly kick and punch the front of house manager and yell expletives before being removed by security staff.
It was later reported that Mitch blamed Blake for her wild behaviour.
A source said: "Her dad thinks her current behaviour is due to spending time with Blake again. Once she was back in Blake's presence, Amy reverted back to her wild ways. Amy had really changed over the last few months and was getting her life back on track. "