Oh? Does she have some secret power? Not that it matters. At this point, she's probably just being provoked into a dangerous situation.
I'm back to trying to wrap my mind around what her stance is. Luxia should save the cheating bastard because...? Has he done anything besides act smug towards her and try to rub his cheating in her face (and even getting frustrated that she didn't care anymore)? Even disregarding the fact that he sold her out and tried to get her killed, which hasn't been addressed at all, she has no reason to care about his safety.
Unless she's under the assumption that Luxia still loves the male lead, in which case, what was all that about the cheating being justified because there was love with one woman and no love with the other?