Separated from spouse for 4 years, not living together no children but still support and pay all household expenses for spouse. Can I claim any relief?

[TurboTaxTara]

Unless the payments are court-mandated or you and your former spouse have a written agreement, your support payments are not deductible. 

You might find the following page from the CRA on support payments helpful: https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/suppor...