My Solo Night With His Keys

I've been single for about a year now and honestly, I'm okay with it. Sure, sometimes I get that pang of missing the intimacy of having someone to come home to, but my job is demanding and I value my independence. Last weekend, everything changed. One night after work, while cleaning up his place, I found his keys hidden in a drawer where he keeps little personal items. A rush of excitement hit me like lightning, along with this strange idea that started forming. Maybe it sounds ridiculous or maybe you'll understand, but here's the backstory: A few weeks ago, one of my close friends from work mentioned wanting to start dating again after a long dry spell. I know he’s been through some tough breakups and has been on his own for a while too. We started talking more about our lives, which is normal. One night we had drinks together and ended up back at his place. I’ll spare the details, but it turned out neither of us was ready to take that step in terms of an actual relationship. But there was this undeniable chemistry. It felt good, and I left with a lingering sense of possibility hanging between us. So you can imagine how my brain went when I found his keys. What if he’s been having these moments too? Maybe something happened one night when he didn’t have his keys or got locked out? And then there it was, hidden away as if telling me some secret story that only someone with the key could unlock. Long story short, I took them and went to an all-night convenience store where I picked up supplies. Then I returned home and had the most intense solo experience ever, feeling like him in a way. It was all about exploring every inch of my body as if it were his hands moving over me. So here’s what happened next. Monday morning, he texted me to say good morning as usual. But there was something different about how he greeted me. He seemed almost more cheerful and asked casually if I had a good weekend. That small change got me thinking... Is it possible my little solo escapade did something? Am I the asshole for assuming it meant anything beyond just friendly text exchanges? Should I tell him what happened, or does this stay between me? Advice appreciated.