[Umaeril]

It sounds like you have been pushed just a little too far. On the other hand, choose your battles wisely. Is it a battle you can win? Will you come off looking petty if you go on the offensive (which seems to be tempting you)? I don't know. So one thing you could do is keep your eyes open and collect some hard evidence and/or get a witness or two to some of the lying. I'm not saying you use it, just keep it on the back burner. You can always move it to the front burner if or when the time is right. Not only that, you never know what might come in handy to know about a person but not tell, keeping to yourself instead. This puts you up a level on things, makes you a bit more observant if you can figure people out and what they are up to. It's just something to recognize is all. You seem to have the gift of perception. Not everyone has this or one would think most compulsive liars would be recognized pretty quickly by everyone...and they are not.