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Yes, that's what I am trying to say that he should have tried to know who's there and who's not.

Yea I agree, but you know trauma sometimes make us blind to what is obvious. I understand how he felt. It was tough

Maybe that's how real life is we can't seem to trust anyone after being alone for a long time.

Yea, that's the real case of how life is. Our heart locks up after so alone for a long time, getting to unlock it will take so much effort.