Dear Holly,I suspect that my husband is having an affair with my sister, but I haven’t yet been able to prove anything. Last night, I walked in to find my sister sitting astride my husband with her top off, lipstick smeared all over her face and his, shouting ‘ride me, cowboy!’. At first I was extremely angry, but my sister assures me she was simply attempting to retrieve a contact lens, and that my husband had very kindly stepped in to help. I don’t want to be presumptuous, but I have a feeling something fishy is going on. Do you think I should confront them?ImeldaLowestoft

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