Why did he stop initiating conversations but responded enthusiastically when I initiated one?

Met a guy online and I messaged first because that's how this app works, he got my number and started texting me. He initiated convos about 4 times, but then stopped initiating so I started a conversation three days after he stopped and he responded really enthusiastically. He vaguely asked me out, but hasn't texted me since that convo, so it's been a week and i'm wondering if I should message him again?
Why did he stop initiating conversations but responded enthusiastically when I initiated one?
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