So if Ross knew, it'd make the storyline make sense. Heidi wants a relationship with Jeremy and opens the marriage. Jared has been enjoying using his fame for sexual exploits too. Holly and Ross open their marriage because she believes she's asexual, which is not the first I've heard of this happening. Jared begins to have feelings for Holly, and Heidi persuades him to tell her. Heidi and Jared are both close friends with Ross and Holly so they know that they have an open marriage too. Heidi says that Ross needs to be fine with it, which he would be. Heidi realizes she may lose Jared shortly after because he's more interested in Holly than her (could be marital issues and now Jared finds someone that he feels cares for him deeply) and immediately goes insane. She demands they stop seeing each other and becomes destructive. Holly and Jared, now with their feelings out there, keep going. Holly is happy to feel something she hasn't felt in years. Jared (and this is just a theory) sees how crazy and destructive Heidi is being and realizes when he's with Holly, he's happy. They grow closer while Jared and Heidi grow apart. Jared wants out, goes to personal and couples therapy, and tries to find a way, while still keeping a hold on Holly. Holly wants to be with Jared and doesn't love Ross any more, so they divorce. She moves to be closer to Jared, expecting he was going to leave her. Maybe he's just too much of a pussy to actually leave, or maybe she threatens to make his life hell if he does. Everything Heidi has comes from Jared and she's admitted to that: cosplays, her business, her car, almost everything. After 7 months, Jared has enough and tells her to move out. He helps Heidi get a new place to live, files the divorce papers, and lets her take the time to move out, paying for movers to take her things to her new home. She decides this is the best time to destroy him, for good or bad intentions. That's how we end up here.
Without a few key pieces of info, we don't know if it's Jared that is the worst part of this or Heidi. Heidi's actions could be justified, or psychotic. Jared could be the bad guy for lying and not caring about his wife, or Heidi could be the bad guy for being destructive and manipulative to the point where Jared starts falling for someone else and wants out.
I want to say it's Jared's fault but Heidi's posted some nasty, vindictive things while fighting anyone that makes her look like anything but the complete victim here. At least it would answer a few questions and connects some dots between each of their stories.