I found out my husband is sexually attracted to my sister. I don't know what to do.

Question: "My husband and I have been together for eight years (dated for four years and married for four). We have two boys, ages 2 years and 7 months. My husband and younger sister have always been pretty close; some people have told me a little too close, but I trusted him and always thought they had a brother/sister relationship.

So, my sister and dad had come up to visit and then take my first son back home with them. I was feeling overwhelmed and needed a break, but my youngest is still breastfeeding so he stayed with me. They were only here for two days, but after they left things felt off. My husband, who likes to write music, kept complimenting me a lot. It almost felt like he was also trying to convince himself of the compliments. I felt like he might have been cheating or at the very least hiding something from me. I had a pit in my stomach that wouldn't go away, so I finally mustered enough courage to say something. He got defensive, saying I was acting crazy and that it made him feel bad being accused of something he didn't do. Then I cried because I thought he was right.