<human>: Can you provide a brief rundown of the text in within 3 sentences?

I had been seeing someone for a few months this summer. Thought it was going well. He continually referred to the future, said he felt close to me, excellent chemistry (initiated by him more than me), dates/communication initiated by him 95% of the time, talk of meeting friends/family, said he wanted to take me to NYC, etc. 

Last week goes out of town. Over the week I get multiple texts (initiated by him) etc. using terms of endearment, etc. Once back, on Friday, he flirtatiously says he wanted to come over tomorrow (Saturday) night. He had plans Friday, but said we would grab a lunch Saturday afternoon and then plan from there.

Cue Satuday afternoon, haven't heard anything. I reach out, trying to figure out what's going on. Over text message, I'm told "something is missing from the equation, he's been mulling it over and he wishes it wasn't missing." Then I'm told "It's not like I don't have feelings for you." Then, after "some time passes", we should be friends. 

Apart from the realizations I've made over the past few days about how shitty of a person he clearly was and how I missed some fairly obvious signs of narcissim and self-involvement, what's up with that? It's one thing when the guy starts to pull away - you can look back and recognize it was coming. But I was blindsided here - literally the night before everything seemed just the way it always was and positive. Looking for any ideas/perspective.
<bot>: Did I mis something? What causes a guy to plan a whole afternoon/evening date the night before and the next day pull the plug?