Why would he lead me on?

I met a guy last month on a dating app. We went out on a date and it was a bit awkward but it went good. We then went on a second date together and I really liked him a lot. We had a lot of similarities and interests. I never felt that kind of chemistry with anyone ever. We then went on a few more dates and really wanted to see me whenever I was free. Texted me throughout the day as well. He asked me exclusive too. He then told me that he had to leave two weeks with his family. We got even closer long distance and told me things like "I was the girl of his dreams, and he wanted me to come on the family trip with him later in the year." He also said that when he got back he wanted to see me every single day and wanted to basically live with him. When he got back we spent the night together and everything went great. Had to leave at 11 am though because he had work which I get. That day I expected him to be all over me like he was when we were long distance but he acted very distant that day. When I asked him he said he had a lot of work which I totally get. Later that night I asked if he could call me because I was feeling vulnerable and wanted to talk. He said that he was tired and I was being inconsiderate which I thought was rude. At the point I was confused what happened to the guy who was obsessed with me. I know someone would say "he just got what he wanted sexually." but A. we didn't do that and B. he really wasn't like that.

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The next few days he acted kind of cold and didn't ask when I was coming over again. I got really annoyed and mad because this wasn't the same guy I knew who was obsessed with me. I went over to his place last Friday and waited in his lobby for an hour. I told him how I felt crying as he just stared at me and we made up... that night he ghosted me and I got really mad. The next day I went over and wanted to break up. We made up... and then I spent the night. I thought everything was fine and the
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I thought everything was fine and then he told me that I couldn't spend the night on Sunday because he had "work." Which did not make sense because he was free on the weekends. I felt really used and sad tbh. Even if I were to bring up how I felt I knew he would find some way to twist it. I wanted like boyfriend where we spend the weekends together and do things like he said we would. Always felt like he just kicked me out.
Why would he lead me on?
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