so I'm was thinking, Rick Prime killed our Rick's Diane and Beth. Then erased every Diane in existence so Rick C-137 could never get her back. But Morty Prime exists, right? So Rick Prime was in a relationship maybe brief or maybe a marriage but he and Diane had a child - Beth. It could be a completely loveless relationship and he obviously couldn't give two fuck's about his Beth but the fact is still there, he murdered a mother of his child. I'm aware, I'm stating an obvious, well known facts but when you think about it hard like that, it's so dark.