What are green flags during texting stage and what are red flags?

I asked a guy out, but honestly we’ve talked a bit and I can’t tell how he feels about me at all. He said yes. But he doesn’t flirt, message me first, he seems uninterested when we talk, he doesn't ask about me at all, he can take over 24 hours to reply. Is this normal in the texting stage? I feel like maybe I asked him out bc of desperation to figure out his feelings but now I’m worried he’s just said yes to be nice. Is it too late to cancel? How do you even take back an offer of asking someone out?
What are green flags during texting stage and what are red flags?
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