Did I miss why Kyle and Mau separated?

I’ve been trying to keep up or I must’ve missed the part where they explained Kyle and Mau’s separation ? From what I thought it seemed like it was something Kyle wanted bc of his infidelity, but this season it’s really seeming like it was his choice (the apartment) and Kyle is always crying about it. The recent episode with them at the shooting range was odd like she was sad and crying then apologizing for it and all he kept saying is yes I know I know. I feel like I missed something?