My husband (33M) and I (38F) have been having problems for almost a year. I went through terrible postpartum after our second child and I went silent a depressed and when I finally opened up the shock make him incapable of being there for me in the way I needed. In turn I sank deeper into my depression and went off the deep end trying to get him to help me in any way, including trying to keep him from having personal time and space. A few months after I disclosed my struggles he developed a friendship with a female coworker and it turned into an affair that went on for 6 months. I knew something was off and I confronted him multiple times and he lied and made me feel crazy for months. After I finally got the truth and the proof everything went bottoms up and our fighting and communication got even worse. For a little while he attempted to say he wanted to fix things and work on us and stay together. Now over a month later we have been doing nothing but fighting with each other and not being able to communicate (we are trying to find a couples therapist) and he told me three days ago that he thinks he wants a divorce and at the very least for now a temporary separation. The reasons he wants this though are because he says we can't communicate, I don't listen to his feelings or care and because he's not sure that he can continue in a monogamous relationship because he believes in polyamory. I'm at a complete loss and I'm utterly crushed.... I love him so much and I want us to stay together but neither of us can see how. He is going to therapy and so am I and we want to do couples but just haven't found one yet. What should I do?

tl;Dr: husband cheated and now wants a divorce