I've thought my husband has cheated before in our marriage.I knew I caught them in a compromising situation, but did not catch them in the act. They both lied about what had happened for 2 years. Then my husband contracted an STD. By lying I got my sister to tell the truth. My husband denied until he found out I had talked to my sister. He finally admitted it. His reason for lying was to save our marriage. How do you save a marriage where you know he cheated one but believes he's been cheating for years? I've been married for 13 years and can't imagine him not in my life. But I can't imagine ever trusting him again either. We're currently separated and I'm not sure what I should do. Please help.