Why did he do that?

I've been talking to a boy who is my friend's friend for a few weeks. We instantly became close and flirted. He was a really good and kind person, that's why we progressed so fast, I thought he was a really reliable person, he is a very loved and trusted person in his circle of friends. He made me feel so much love and trust that I really fell in love with him in those 2 weeks, he was asking me questions like would you marry me or something. but yesterday he started to tell me that he was really confused and that the problem was not me but him, but that day everything was fine again, nothing happened. He told me that he was flirting to make me happy because he likes to make people happy. He didn't know how to finish it, so he continued, but if that's the case, why didn't he tell his friend, who is my friend, that he wanted to finish it? Before this incident, he was talking with my friend about how much he loved me. he didn't give any explanation and he's not even unhappy, he doesn't care. Why do you think?

Why did he do that?
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