If you separated or divorced in 2018, the CRA will still require your spouse/common law partner’s information.
I’m separated or divorced. Why am I being asked for info about my former spouse/partner? https://turbotax.community.intuit.ca/replies/3425400
What to do if you don’t know your (ex)spouse’s income? https://turbotax.community.intuit.ca/replies/2647950