False optimist
Somebody that keeps trying to tell you it's all good between you and them (despite every indication to the contrary) or that you've forgiven and forgotten everything on their end, even though you're not forgiving or senile by nature.
The real cynics are the ones that seem to think everything is okay with everybody all the time, or that everything will be okay, so people shouldn't worry. That is false optimism, and people (a false optimist) who think that way are not good liars.
False optimist by The Original Agahnim August 31, 2021
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