Can’t you just find out it was a lie by noticing that what they said wasn’t true? Of course it could be that they were wrong but also if it turns out they were the baddie…
They also tend to spell out the way the character deceived you without lying anyway, so just flat out having a character tell you that another character lied wouldn’t be weird.
Because it is hard to convey a lie through story, unless blatantly saying it was a lie afterwards.
Can’t you just find out it was a lie by noticing that what they said wasn’t true? Of course it could be that they were wrong but also if it turns out they were the baddie…
They also tend to spell out the way the character deceived you without lying anyway, so just flat out having a character tell you that another character lied wouldn’t be weird.