Crystal and Sarah kept seeing married men.

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Crystal says when she first started seeing a married man, she was never told about his marital status. "By the time I was emotionally invested, I found out that he was married," she says. "He was able to be with me physically so often, and she didn't question his whereabouts. I began to believe that she didn't care and that she was okay with it."

Sarah says she also didn't know for some time that she was dating a married man. "He was everything I looked for in a guy. I thought I'd found Mr. Perfect. So when he dropped the bombshell that he wasn't actually that available, I moved into another stage," she says. "I was deeply in love with him, and I thought if I kept going with this [affair] and being the person he'd fallen in love with, I could somehow win him away from his wife. I wanted to be number one. That was my challenge then."