The longtime former girlfriend of Sean Combs has no doubt the rap mogul cheated on her during their relationship, but dismisses reports linking him to actress Sienna Miller. Model Kim Porter walked out on Combs, with whom she has three children, last month (Jul07). And, although she is convinced Combs saw other women behind her back, she is adamant Alfie star Miller had nothing to do with their separation. She tells OK! magazine, "They're just friends. That wasn't the cause. "(But) I will never sit here and say that Puffy - or any man - is 100 per cent faithful. I just don't believe it. "Some of you are, but I'm not going to sit here and say that I didn't believe that he cheated on me. I would never say that. I'm aware that he's cheated."