How do you tell a guy his girl cheating on him with out hurting him?

there is no way of telling him without him getting hurt but Words from somebody that told a friend her boyfriend was cheating on her she got mad at me and i lost my friend and they are still together there is no way of telling him without him getting hurt but Words from somebody that told a friend her boyfriend was cheating on her she got mad at me and i lost my friend and they are still together