If you are using a gun each, then you are in the wrong.
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On Page 3 of "Application for a Possession and Acquisition Licence Under the Firearms Act (for Individuals Aged 18 and Over)" (form 5592), section F, "Information About Former Conjugal Partner (Refer to Information Sheet)" specifies the following:
Provide information about your former conjugal partners. This includes any person, other than the person named in Box 18, with whom you have lived in a conjugal relationship within the last two (2) years. If you need more space, list the information on a separate sheet of paper.
If it has been over two years, you are good to go.