Welcome to Plathville season 5 star Micah Plath recently implied that his former sister-in-law Olivia Plath was more likely to be a cheater than his brother Ethan Plath. Although he didn't spell it out, he became a part of an increasingly messy divorce. In the future, he might regret getting involved, as it's possible that he doesn't know everything that happened between the exes. Sure, he wanted to defend his brother, but what if Olivia was never unfaithful? Now, everyone's wondering about her, as they also question Ethan's fidelity to her.