Are you absolutely sure that's the only reason he was acting, though? I know sometimes my inmate has told me she's done some awful things because she was bored. There's usually something much more underlying than just killing on a whim - and that might really prove you have got somewhere.
Because, in the end, you have to hope and look for the best in him; and the fact you expect better doesn't mean, necessarily, that he's betrayed you. It means that there's been something there where he has proven himself to be a better man. If you continually expect the worst - that's all he'll show you.
Things go wrong, we can all get our perceptions wrong, and take them wrong. It doesn't mean everything good you've seen in him - you must have seen in him to think he wouldn't do this - is invalid or worthless or even wrong.
Re: private
Because, in the end, you have to hope and look for the best in him; and the fact you expect better doesn't mean, necessarily, that he's betrayed you. It means that there's been something there where he has proven himself to be a better man. If you continually expect the worst - that's all he'll show you.
Things go wrong, we can all get our perceptions wrong, and take them wrong. It doesn't mean everything good you've seen in him - you must have seen in him to think he wouldn't do this - is invalid or worthless or even wrong.
If that makes any sense.