What are red flags in dating, is this a red flag?

He is a polite, nice guy. Smart and cute. We know each other for 3 weeks. And I meet him for the third time. He said he is confused, and is not sure if he want to be with me in a exclusive relationship. So, we're messaging here and there, but not really connecting. Only when we're talking. But most of the time, he has no time for me. So, overall... I don't know if I just stop talking with him. I want someone who is enthusiastic about me...
What are red flags in dating, is this a red flag?
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