David Boreanaz and Jaime Bergman'Bones' star David Boreanaz is joining the Tiger Woods' club of infidelity. (Other members include Jesse James and Tiki Barber.)

Boreanaz admits to PEOPLE that he was unfaithful to his wife of 9 years, Jaime Bergman. "Our marriage has been tainted with my infidelities. I just want to be open and honest. I was irresponsible," he revealed.

The actor is coming forward because his former mistress threatened him. "I was associated with a woman who I was involved with and had a relationship with. She asked for money. I felt as though I was being blackmailed or there was some sort of extortion."