Guys, Guy seemed super interested but then broke it off out of the blue?

There’s a guy who I have been friends with for a while. I liked him as more than a friend for about 6 months now and wasn’t sure if he felt the same. But a couple of weeks ago, he kissed me after a night out and said that he had wanted to do that for months. Since then, the last couple of weeks has been pretty intense. We went on 4 dates, got intimate with each other, he was always asking to meet up lots. He told me he really really liked me, that I meant a lot to him, took selfies of us when we were out on dates and sent them to his family! He was the one driving this forwards at this pace, which is far more intense than I usually move with a guy but we have been good friends for over a year so it seemed quite natural. Today we had arranged to meet for another date, which he seemed super keen about yesterday, but instead he text me this afternoon saying he ‘wanted to talk about things’, so we just went for a walk instead. He told me that he didn’t see this working out long-term and whilst he was enjoying dating me and spending time with me, he realised this morning that a relationship wasn’t what he truly wanted. I feel completely blindsided and confused given everything that he has been doing and saying over the last couple of weeks. Why would a guy tell you that he really likes you and openly talk about you to his family if he wasn’t sure that he wanted to pursue a serious relationship? We both had a great time on the dates, had a lot in common, have similar values and want similar things from life. He said he finds me very attractive too, so I’m just really confused right now and would love some insight from guys as to what on earth has just happened for him to come to this conclusion? He really wants to remain friends, but I’m not sure where this goes from here or what I should do now? Thanks in advance

Guys, Guy seemed super interested but then broke it off out of the blue?
Post Opinion