He initially wanted a relationship, but doesn't want one now. Why?

He is one of my mutual friends. And I used to see in University and social media. We starting talking online and became close , then he confessed me that he likes me. Since I was not ready to be in a relationship at that time because of some issues we were just in a talking stage. Till June he wanted a relationship and we usually have fights from July. But now when I am ready to be in a relationship he doesn't want one but still says he loves me. He became less sweet and polite. What do you think about his behaviour

He initially wanted a relationship, but doesn't want one now. Why?
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