Is there a way to understand why your partner lies without jumping to conclusions like cheating?

With September inflation at 3.7%, broad beyond just oil/gas and the Fed probably forced to raise interest rates again, can Trump and the Republicans pull out the midterms which have tightened especially the Senate and House gerrymandering?
How has the lack of secure employment and high housing costs impacted British society?
Is it really worth trying to be civil to someone who's caused you a lot of harm, just to keep others from picking sides?