verb
BAD : After he was caught stealing, nobody trusted in him.
GOOD : After he was caught stealing, nobody trusted him.
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trust in = (formal or literary) have faith in: 'All will be well as long as you trust in God.'
trust (WITHOUT in )= believe that someone is honest (and will not hurt or deceive you): 'He's just a bit too friendly and I'm afraid I don't trust him.' 'I'm the only person he'll trust to look after his money.'