Kim Mathers is claiming that Marshall Mathers cheated on her throughout their marriage. While Eminem was on tour, he would be unfaithful constantly. What a SHOCK! Kim says it was their biggest challenge and the main reason for their divorce.

She says the biggest challenges in the relationship were "him being on the road and on tour. That was like the big one and constant infidelities - all the time." Kim says she found out about his affairs, "Just from word of mouth (and) walking in on him a few times." The 32-year-old confirms she caught him cheating saying, "Yeah, on his (tour) bus."