When you begin with the premise "I treat everyone equally," you have already blinkered yourself from seeing where you don't, or can't, or shouldn't. There is no way to treat two people equally, because they are each unique, with respective strengths and weaknesses.
Anthony D. Ravenscroft, Polyamory: Roadmaps for the Clueless and Hopeful: An Introduction on Polyamory
equality, polyamory, relationships