Some guy asked me out...the only problem is...?

He kept going on before about how he doesn't want a relationship & he's too young, too much energy & longest relationship was 2 months. So why did he ask me? Should I be wary of him? Recently he's been saying he has a lot on his mind & needs to clear his head. When I meet him we have such a good time & act like a couple but I don't know what he wants