I have some troubles in that I get set in my ways

so when I get an alternate view of another person I know/love a certain way, even if I don't think the alternate story is "true" I still have that story in my head spreading its creeping crack of doubt! My husband's ex-wife did that to me telling me her view of what he'd done/been like that I knew couldn't be correct but still. . . now I have those thoughts stuck in my head forever.