Secret Love Affair

I am not sure if this qualifies as totally awkward, but I found it amusing.
At work last week, I heard two of my coworkers discussing movie times, and I almost asked what movie they were going to see and jumping in on that conversation, but then it occurred to me that they may be discussing a date. And I wondered why exactly they were discussing plans for their first date at a register with a bunch of people milling around. Plus, the girl is a freshman of sophomore in college and the guy graduated last year or the year before. I guess that's not too much of a gap.
Anyway, the next night, I was working with the guy, and our supervisor was asking him if he could stay late. He was like, "Oh, no, you know usually, I would, but you know, tonight is just one of those nights I'd have to turn you down. I mean, I actually have plans tonight, so it just wouldn't work out. I'm sorry, but I can't help you out." He clearly was hoping our supervisor would ask what his plans were, and when she did, I discovered that the conversation I'd overheard was, in fact, about a date. But even though he went on for the rest of the night about his date, he wouldn't tell anyone who it was with! But I knew!!! So I thought that was funny.
A few days later, I was working with the girl, and the guy came in for his shift, and neither of them seemed sure how to act around each other, even though they had been pretty chatty in the past... Today, for example, the only register open when the girl got to work was the one right next to the guy, and they hardly talked at all as they stood there.
I suppose it doesn't really mean the date went poorly, though. It could simply be that they don't want people to know they are dating? Or, they don't know how to go back to being coworkers, cashier/bagger, now that they have so much more? Hahahaha. Who knows! But so it's a little bit awkward, but not so much for me. Just that I heard the initial plans for the date, and I feel like no one else knows about it, so I am in on a secret...