Why does he text me first and not respond?

For a few months now, we’re only friends with benefits but he started acting real funny out of no where. Like his vibe wasn’t right and he started taking hours to respond, or not at all. Last time when he asked to come over and did, we didn’t even have sex and I don't know why not. Okay so I started feeling like he might not be into me anymore and left it at that because I don’t have time for games. He has been texting me almost every day asking “wyd” “can I pull up”, stuff like that. I’ll respond and tell him yeah, pull up. And he doesn’t text back. I stopped responding but he will still text again the next day, I’ll respond, and it’s like a cycle. I just want some advice on why this might be happening.
Why does he text me first and not respond?
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