I've tackled a similar conundrum in my using Facebook to get to know one another. To see what my advice for this similar Twitter situation, just read more.
- He's probably into you: He may not want to have babies and run off into the sunset, but Twitter is updated every millisecond and it is hard to keep up even when using a Twitter management system. It sounds like he is paying close attention to your activity because he wants to get to know you better, cares what you think, and likes you whether as a friend or girlfriend.
- Are you into him? If so, Tweet back: If he is reading your updates close enough to quote them he is asking to be interacted with and trying to show you he's interested. If you want to explore where this real/tweetlationship might head, retweet his witty updates or reply back to him. Both will flatter him. If things get really flirty, take it to your direct message inbox. You don't want anyone else to be able to quote your interactions.
- Just not that into him? Take heed!: If you decide you don't want to get too friendly with him, pay attention to your interactions and updates. Don't engage with him daily — that could be perceived as misleading. If he gets annoying and continues to parrot your tweets when you see him in person, block him or send him off-guard with tweets about your dates or crush.
It's a cruel Internet world out there, and it can be hard to decode people's intentions. Check out my Tech Dating 101 series, where I help disperse a double whammy of tech and relationship advice, for a little support.