Lady GaGa‘s boyfriend a cheater?

She has been dating Taylor Kinney since meeting him on the shoot for her music video You and I.

“All of her friends are telling her to watch her step. Taylor is bound to break her heart. It’s only a matter of time before he finds someone else,” a source said.

Taylor’s ex Brittany Sackett claimed she was still in a relationship with the actor when he first started dating GaGa.

“She was with my boyfriend, and I found out he was cheating on me,” Sackett said..