I accidentally posted a confession of feelings for my coworker into our vacation group chat instead of her DMs. She replied saying yes, but explicitly tagged my roommate, assuming he sent it because he borrowed my charger earlier. How do I fix this before they go out tonight?

Breathe, don't run into the woods, and accept that your dignity just took a detour through a bad sitcom plot. Here’s the silver lining hidden behind your sheer horror: she liked the message. She was thrilled by your words, your vulnerability, and your timing—she just mentally slapped the wrong return address on the envelope. Leaving your roommate to walk into a date he didn't ask for is a disaster for everyone, especially you. Rip the band-aid off immediately before anyone starts getting ready. Pull her aside in person for sixty seconds and say: "Hey, quick correction before tonight gets weird—that message was entirely from me. I sent it to the group by accident, but every word was real." Then ping your roommate so he doesn't innocently wander into your love life. You'll blush, she'll probably laugh in relief, and the awkwardness will last roughly four minutes. Owning the mistake is literally your only ticket to that date.