The Sun reports that GaGa, linked to the Vampire Diaries actor since September, believes she cannot handle a long-distance relationship.
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The 'Edge of Glory' superstar is touring her 'Born This Way Ball' for 110 shows until 2013.
"She'll be touring non-stop until next year and she can't have a relationship at the same time," an insider said. "There's no room for anything else. Her work is all-consuming."
It was previously rumoured earlier this week that the pair are simply taking a break from each other.
Tickets for Lady GaGa's 'Born This Way Ball' UK tour are now available here.
Watch Lady GaGa's music video for 'Yoü and I' below:
