Jude Law's former wife Sadie Frost has spoken of her heartache after she heard reports linking her ex-love with Nicole Kidman. British tabloids picked up on the rapport between the Cold Mountain co-stars in 2004, printing pictures of the pair together. But Frost, who subsequently observed the turmoil caused by Law's infidelity during his relationship with Sienna Miller, admits she still doesn't know what really happened between her then-husband and Kidman. She says, "I was upset. I was hurt. "But I still don't know some things and I'm not going to comment on it because I don't know the truth."