Dear Friend,
Confronting a person who's causing pain wouldn't be an issue, so long your intentions and emotions are under your control, and your "acting" to the situation and not "reacting" to the situation. If you're wishing to confront the person to release your emotional pain in anger, frustration or hatred, I would avoid it until you can calm down, breathe, and speak in a serious but calm tone.
It depends on the situation if you should just pray it gets better, once you've done everything you possibly can with love, you should just keep praying to Guru Ji to resolve it. (The ability to do things with love is the strength and gift from Guru Ji, so you should pray for that during the process).
That's an amazing trait you have, I commend you, always telling the truth is one of the hardest things. Even I lie sometimes,and that always passes through my head, that I shouldn't have lied. A person who lies shows lack of trust and faith in Guru Ji, a person who is truly truthful, has strong faith and trust in Guru Ji for all outcomes of any situation. To answer you question, anyone who lies and causes harm, you should let it be known they've lied. Of course, you'd have to analyze each situation on how you should let it be "known" as you don't want to humiliate person or hurt someone's feeling without fully understanding the situation first.
Hope that helps a bit.
Good luck,
-Namastwang Akaale, Namastwang Kirpaale!
