I am an optimist. My DW is intermittently an optimist but has a familial tendency towards pessimism.  Her whole family is generally pessimistic and takes things that are entirely beyond their control extremely personally and intensly.   The things they can control, they basically don't, and blame it on their bad luck or being victimized by the nepharious "man" or "system". 

My DW intellectually understands that bad outcomes are rare and usually directly related to the quality of effort or decisions.  Her outcomes are overwhelmingly positive but intermittently she jumps on her family's penchant for being victims. 

COVID is proving to be a challenge for her.  She is hell bent on blaming my positive status on my office mate when I interface with dozens of people daily in relatively close proximity.  I am more pragmatic about it and assure my office mate that it is not his fault and try to assure my wife that I was exposed to dozens of people in teh few days preceding my office mate's positive test result and my submequent active case of COVID a few days later.

As an optimist, I am occassionally wrong. But not often.  When she is in one of her pessimism cycles, my DW is nearly always wrong and yet... she remains somewhat committed to pessimism when she is in that phase.

Though I am not all that into self fullfilling prophesy, I do think that positive people tend to have positive outcomes and negative people tend to have negative outcomes.

IMHO there is just more active energy and actual activity that drive positive outcomes for positive people and the converse is true for negative people.

Not that my DW is negative, she is definately a happy person. But when her genetic predisposition for pessimism engages, I sometimes struggle with having enough optimism for both of us.

Do others have this kind of counter balance in their primary relationship?