How would you react if your boyfriend/girlfriend admitting to trolling online, making up random stories for attention?

Perhaps this is something trivial and I wouldn't break-up over that but how would you react? I once dated someone that admitting to trolling online under various fake accounts and I thought that was kind of funny and weird. We broke up for other reasons though.

Scenario:

You find out your boyfriend/girlfriend has been trolling online and making up stories on other forums for attention. They even write a long, fake relationship story just for the sake of it. How would you react to that?

How would you react if your boyfriend/girlfriend admitting to trolling online, making up random stories for attention?
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