There is no way at all that Diana was mentally unstable. There is nothing wrong with expecting your husband to be faithful and being angry when he isn't. Diana had every reason to believe that Charles and Camilla never stopped seeing each other.
I know of no more disagreeable situation than to be left feeling generally angry without anybody in particular to be angry at.
And an integrated life is one where you're able to fit the different pieces of your life together in seamless fashion.
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