Should I be worried that my significant other of 4 years has close friends that cheat on their wives and girlfriends? His friends confide in him and he supports their actions because he claims that it is their own business. However, he tells he that he does not believe in it himself. His own father has cheated on his mother. I am afraid that he since he does not speak out against these acts, that it is not truly an important moral/value of his, however he claims that what is good and works for some couples does not work for others and that he himself does not believe in cheating. Can someone be close to people who cheat, but not believe in cheating? If so, why would he not want to preach to them about their "bad" behavior? Should I be worried?