TIFU by sending a screenshot of a chat… to the person I was talking about.

This happened yesterday and it has been sitting heavy on me ever since.
I was feeling frustrated with a coworker. They have been a little passive aggressive lately and it has just been getting under my skin. I was venting to a friend about it because I needed to let it out. I wasn’t trying to be mean. I was just tired.
I took a screenshot of one of their messages to show my friend what I was talking about. And without even thinking I sent it to the coworker instead.
The second I saw it go through I felt sick. My heart dropped. That horrible feeling where you wish you could take something back but you can’t. I just sat there staring at my screen, hoping somehow it didn’t happen. But it did.
They replied after a few seconds. All they said was, “Wow. Good to know.” Nothing else. No anger. No reaction. And for some reason that felt even worse.
I tried to say sorry. I tried to explain that it was a mistake and that I didn’t mean anything by it. But really, what could I say. I knew I messed up.
Now I keep thinking about it. I feel embarrassed. I feel anxious about seeing them. I wish I had just slowed down for one second before I hit send.
I know it is not the end of the world. But right now it feels like one of those mistakes that is going to stay with me for a while.

TL;DR: I accidentally sent a screenshot venting about my coworker to them instead of my friend. Now I feel awful and can’t stop cringing.