Guys, what could he mean when he says "what are you doing to me?"?

I've been talking to this guy lately who I am not dating. I know he likes me.
He compliments me all the time: you're cute, adorable, the funniest girl I've ever met, pretty, I'm comfortable around you, a nice smile and a cute laugh.
The only reason we can't date right now is because in a few days, he is moving back to his home state. We've talked about how we would stay in communication and we have joked many times about me going to see him.
This has happened twice but right before he leaves to go to work, he looks at me, laughs, and says "what are you doing to me?"
Then we kiss, hug and he leaves.
What could he be thinking?
Guys, what could he mean when he says "what are you doing to me?"?
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