Why is he acting like this?

So, there’s this guy at church that loves to stare at me. He tries to get close to me. He will also make small talk. Today he sat behind me but didn’t say anything and the chairs were close. He also would tap me on the shoulder. I think he was flirting. Not sure. What would make him act this way? Is he interested in me?
Why is he acting like this?
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