Unexpected Twists After the Breakup

I recently got divorced after ten years of marriage and am still figuring things out. No strings attached flings are where I’m at right now, and everything was going smoothly until last week. One night, while we were hanging out with friends, my date from a couple days ago, let’s call her Jessica, suddenly appeared. She didn’t know about the current arrangement but saw me being cozy with someone else. We’ve always had a good time together and today it happened again, minus any real commitment. The chemistry just reignited in ways I hadn’t expected. Now she knows about my casual dating setup. Did we do something wrong by not keeping this strictly between us? What if Jessica feels used or hurt?