If a guy says "you're killing me" what does it mean?

Anonymous
there's a guy who is MUCH older than me but he knows I'm intrested because my coworker told him. For the past few times he's came to my work he's been giving me the eyes & even asked for my name. Today I wore something that showed off my hourglass figure and he kept looking at my stomach. When I took his order he was like "how are you?" & I said good & then he said "I bet you are," then said "I shouldn't have said that,". Then he asked my age & i told him 18 then he said "you're killing me'". My coworkers said it's probably cause he can't take me to the bar & get me drunk.
If a guy says "you're killing me" what does it mean?
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