I’m a thirtysomething straight woman married for 16 years. Eighteen months ago, I met a man and there was an immediate attraction. For the first 15 months of our relationship, I was his primary sexual and intimate partner, as both sex and intimacy were lacking in his marriage. (My husband knew of the relationship from the start and is accepting for the most part.) After my lover’s wife found out about me, she suddenly became very responsive to my lover’s sexual and emotional needs. My lover has told his wife that he will not let me go. He has also told me that he is not willing to let his wife go. She isn’t happy about being in a triad relationship, but she allows him to continue seeing me with limitations. I am no longer his primary sex partner, and I have been relegated to the back seat. He claims to love us...