Several alternatives are possible. My reading, without context: Breaking the confidence of one/someone (or even committing treason against one/someone) has happened to (has been committed by) some of those which are close to me, and I definitely want to avoid that character flaw, thus ... or: Failing someone/Treason has showed up lately amongst my entourage/friends, and I want to avoid doing it myself ...
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SarramThank you very much for answering so quickly.We're no
Unfortunately, I don't think that these solutions can suit in this context. Actually, Charles I was the one who betrayed somebody, namely Thomas Wentworth, one of the main royal advisers. Charles I did nothing to prevent the parliament from trying him. He was sentenced to death...