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How would they even know you had a girlfriend? That's not something publicly available like a marriage record would be.

Couldn't uber tell if you had one night stands? Wasn't there a telecom tracking service that was until recently open to the public, where you could get locations of phones just by the number?

If there was some geolocation between two devices registered to accounts owned by opposite sexes of similar age spending time together, overnight & with time, then you have the data you need?

Yes.

This was in the early 2000s. I’m not sure how effective pervasive cell phone data gathering was yet for people who weren’t customarily targets of surveillance. Maybe I was a test case since I was doing a lot of match.com type dating.

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