Canna ter? Well, dunna fret

Hi,
Here are some words from the novel Lady Chatterley's Lover(the sixth line, page 253, chapter 12) by Lawrence (planetebook):

‘But what’s amiss?’ he said. ‘It’s once in a while that way.’
‘I . . . I can’t love you,’ she sobbed, suddenly feeling her heart breaking.
‘Canna ter? Well, dunna fret! There’s no law says as tha’s got to. Ta’e it for what it is.’
He still lay with his hand on her breast.

What's the meaning of canna ter and dunna fret please?
Thank you in advance

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Canna ter? Well, dunna fret