Why did he say he was lonely?

Why will a guy admit he lives a lonely life? For context, I've been frequently traveling to his city. He has been convincing me to stay in his city and I declined. Then he said he was done convincing me. After, we talked about problems then he admitted he lives a lonely life. So much that he sometimes contemplated suicide. I said what about his room mate? He said they dont talk much. Why would he admit this to me? He is a self admitted loner but i get that there are times he'd rather not be.

Why did he say he was lonely?
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