<human>: I decided to be spontaneous and do something I'd never done- try a casual thing with an attractive guy who I had no intention of Getting serious with due to his being very sexually and romantically experienced. 

So I found said guy on a dating app and we met up and fucked for the night (after just meeting) and stayed up all night, talking a bit and having sex. It turned out to be one of the most fun nights I've had in a while, even though I don't want a relationship. He was very curious about me even though he said originally he's not looking for a girlfriend right now, and we talked a lot about sex and were rather blunt for people who just met. I was very adamant that it was a casual thing, and even said at one point "this is the best one night stand ever" and he was like "it's not a one night stand, it's not a one night stand" to the point where it made me feel like he was into me more than I was into him.

Then in the morning he was pushing me to stay to make me breakfast, have coffee, talk. And I said I had to meet a friend (which was true) and I had to go, and that I'd grab coffee on the way. And he seemed to keep saying the whole night that he didn't think I liked him, etc. and maybe he took the me leaving early thing as me not liking him too.

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<bot>: I obviously want to keep this purely casual because he's not my type and avoid talking more than simply small talk. However I don't want to get too attached. How can I do this?