It's not fair.
You know you're being ridiculous. Nothing in life is fair; suck it up and get over it. But despite all the things you have—that you know you take for granted—this one little issue—this one thing—that you can't have is driving you insane.
You deal with it every day. The jokes, the stupidity, the general feeling that nothing is right. It's been okay, the knowledge that you're both pretending; the thing that kills you is that neither one of you will acknowledge it, even when you're alone together and there's no one around to judge. There's plenty of time to say something about it, but it gets lost in pointless rambles and eating breakfast in dinosaur pajamas.
There's nothing to do—it's like being in a stranglehold. There's only so much silent screaming and half-hearted kicking that can be done before you give up.
And that's the end, you suppose. You give up. You pretend.
But you can't move on.