Why would a guy allow another guy to manipulate/hurt his own sister?

Anonymous
I just wrote a question similar to this but it was too long so I’m going to shorten it and if you have questions you can ask me or refer to my other question for more information. Basically my ex boyfriend pretended to be related to a boy who was really just his friend. The suspicious part is that this young man was actually related to my ex boyfriends last girlfriend whom my ex was continuing to see behind my back. He was playing both of us. So my question is, why wouldn’t the younger “brother” speak up and tell either me or his own sister? If he loved his sister wouldn’t he tell her that she was being played? I get that the guys were friends and there is a “bro code” but still, wouldn’t any guy try to prevent his own sister from getting hurt?
Why would a guy allow another guy to manipulate/hurt his own sister?
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