Three nights without sleep. I keep thinking about that couple from Vegas

Three nights without sleep. I keep thinking about that couple we met at the Red Rooster takeover in Vegas eight weeks ago. We did a soft swap in their suite at the Cosmopolitan. Two hours, very gentle, all four agreed it was great. Texted for a couple weeks after. Then we let it fade because they're in Phoenix and we're in Austin. The problem isn't them. The problem is that since that night my wife has been different. Hornier yes but also distant in a specific way — she goes quiet at dinner, scrolls back through her own photos from that weekend, doesn't want to talk about 'next time' because every couple I bring up she shrugs at. Last Saturday I asked her flat out if she was hung up on him and she said 'I don't know what I am, I just feel weird in my body.' We're ten years married, two kids, third anniversary in the scene. About a dozen scenes total. Nothing has hit her like this before. I keep watching her check her phone at 1am and not knowing if it's him or just the internet. Has anyone watched a partner have a delayed reaction to a one-night thing and figured out whether it was about the guy or about something he opened up in her?