Thorn:

I can't give any response at all towards cheating as I'm responding with my mom and brother's reactions to things.

They get PISSED OFF immensely if someone dares to "lie" to them. Even if it's not a lie - they have their own interpretations of their own behaviour, and if someone calls them on it they flip their S*** and rant and rage about how someone could DARE lie about what they did or didn't do... because they won't admit that they did whatever it was and will basically try to pull it off as someone is trying to slander them.

And a lot of people lie and cheat... with or without disorders. I think it's always done for the same reason - because someone wants to do X and knows that they shouldn't, but thinks that they're smart enough to not get caught or think the person they're going to hurt will forgive them and that they'll get away with it.