Singer Miley Cyrus has been reportedly ignoring her boyfriend Patrick Schwarzenegger's phone calls since he returned from his spring break in Cabo.

`Patrick has been trying to reach Miley since he's been back, calling her over and over and she hasn't been answering his calls,` eonline.com quoted a source as saying.

`He's very upset and is doing everything he can to try resolve things. Patrick is extremely frustrated because he's been actively trying to be very good and to make this relationship work," the source added.

Patrick was photographed getting cozy with a bikini girl during his vacation. He denied rumours that he cheated on Cyrus.

`Omg. It's one of my best friends girlfriend... Would NEVER do anything against my GF... Girls have guy friends and guys have friends that are girls,` he said.