Cas was worried?! Ruby had barely been able to focus for the worry, but it was all fine now, or...well not fine. But better. "So was I, but it worked out. Not great or anything but its something right?" The fact that he seemed to care such a lot about the boy he called 'Abomination' wasn't lost on Ruby. She understood how hard it must have been and while she couldn't think of Dean in anything close to the same way she knew it was important that Cas cared for the brothers. Both of them. Everything he'd done for Dean, she remembered it, Sam did too, but it had gone, faded from Dean's memory and Ruby couldn't help but wonder if it was something heaven had done. Zachariah perhaps having found another way to get at Castiel as revenge.
It was possible, and Ruby had a sneaking suspicion it was true. It made her feel awful for Castiel though. She only needed to look at him to know it angered him, confused him too. It wasn't fair. None of this was fair, and her annoyance at having to explain her switching sides to Dean again was little by comparison. "...I remember?" she tried, "Sam remembers. Sure its Hells Poster Boy and his demon girlfriend but its something isn't it. Dean will listen to Sam, and no, its not fair. In fact it sucks beyond the telling but you're not going to change it. You'll just have to build a friendship again. You're not the same angel you were back then and no I don't mean the powers. I mean...you're different. And Dean is going to see that"
Maybe. Hopefully. Dean was a moron after all. But maybe he'd actually wake up and realise everything Castiel had done for him over the last year. If he didn't Ruby might just slap him. In fact she might see about slapping him anyway. All in the name of fixing his amnesia. "He'll be persuaded Cas, there are ways, there are things we can do. He won't forget you just like that"