Faithful No More

I've been married for five years and have been faithful to him in all that time. Last week, his brother was staying with us. One night, we were watching TV and just started kissing. My husband had gone to bed. I knew it was wrong, but I let him keep going, and we had sex. He was so good! But now, I feel guilty, and I am thinking of telling my husband. His brother says not to, to keep it our little secret. I don't know what to do.

— Beth, 29

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