I don't let them use me. But if a good person hurts me, doesn't it follow that they didn't do it maliciously? There are a lot of reasons why you might get hurt by people who you think care about you -- and by people who really do care about you.
[his parents' betrayal, of course, doesn't count; they were terrible people. but, for instance, Suzaku shooting him...
...there's no point in explaining to this boy the mixed blessing of free will. but he says, simply] Everyone makes mistakes.