Jon is extremely depressed because he feels that he is responsible for his wife's suicide; he believes that he should have detected warning signs and helped his wife. Jon's thoughts here are illustrative of:

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Jon is attributing the cause of his wife's suicide to himself, indicating an internal locus of control. He also appears to be making a stable attribution, as he believes that he should have detected warning signs (suggesting he believes this failure is a permanent aspect of himself rather than a situational factor). There's no indication of a global evaluation or external locus of control in this scenario.

Jon Is Extremely Depressed Because He Feels That He Is