I have a similar story to Adzyb, except not Canada but the US, and I've wound up bidialectal. Back in the UK when I speak to Brits I sound British.
But when I'm home alone talking to myself going "oh no I forgot to buy butter" -- I sound American again. Same when I talk to pets and other animals, and to people who know my bi-national history, and with whom I've become comfortable and they wont give me a hard time over it.
It's genuine and mostly unconscious, although I would say with strangers and in certain circumstances I do have a conscious decision I'd better stick to the accent that would cause the least fuss and unwanted attention.
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