I don't understand my last hookup...

So I was on Grindr one night and this guy messaged me and wanted to come over, he had been drinking and had a bit of MDMA. He decided to start walking 4km to my place, to which I eventually called a taxi for him and paid for him to actually get there. He came over and we talked a bit and then fooled around and then cuddled--he slept over. The next morning we actually got up together to get some water in the kitchen and then went back to my bed to cuddle and sleep some more. He smiled then said "until next time" and left. After thinking about it for a while I messaged him and asked if it would be weird if I added him on fb because he was really interesting and wanted to stay connected. He then said that I could. I added him, and then after an hour or so I realized he blocked my fb, me on grindr, and blocked my number. I'm actually kind of upset because I wanted to see him again. I understand people like the whole NSA but he was clearly out and didn't strike me that way. PLUS, I don't understand why he'd even bother texting me back in the first place when I asked to add him on Fb. Is anyone able to help me to understand the thought process of this guy? I'm kind of upset about it still and need to vent/advice.