Yes, Ramza is naive to the max, but Miluda still doesn't warrant much sympathy. Teta is a commoner who warrants sympathy.
Also it would be more akin to a Nazi finding a Jew in hiding and saying, "Look, I won't turn you in, just go," and the Jew refusing. Of course, there would be a natural doubt that he would keep his word, but still, the Nazi is traveling around with a Jew, to boot.
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"I couldn't stand a day without a past or future. I need to live each moment to keep fighting here and now."