Well technically she was just a one-night stand with Data, quick bang, wham bam thank you android, and gone. Dont' you remember: "Data, I'm only going to say this once: It never happened!"
Not much chance for hearts and flowers there.
Data did have a realtionship with a girl in a later episode (can't recall the name, was it "Data's Day"? Not sure but I don't think so) and when it turned out he was clearly using her as a sort of test programme, studying her and trying to adapt to her needs, she ended it. His mic drop was the best.
Data: "Is our relationship over then?"
Girl (can't remember her name): "Yes, Data. it is."
Data: "Then I shall delete the appropriate files."
BOOM!
