Why did my guy friend tell me he wants to be friends, but we can't be close/best friends?

My guy friend flirts with me, especially when drunk. He has a history of saying we should go out sometime, holding my hand, staring at me, hugging me, etc. We've never talked about it because we both get awkward and then he'll say he doesn't remember. He also tells me he still remembers when he first met me (4 years ago). We were having a conversation and he told me that he wants to be friends with me, but we can't be close friends and asked if I knew what he meant. He said he didn't know how else to put it, but not to overthink it. I don't get where this is coming from or what he means?

Why did my guy friend tell me he wants to be friends, but we can't be close/best friends?
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