I think my dh might be cheating on me. My sister calls him every day. They don't ever bother trying to hide their feelings. She has children and is married. I don't understand why she would be doing this to me! I would start an affair with her dh but he just doesn't turn me on at all! I can see why she thinks mine is better, but she has her own! I don't know what I should do! I don't want to leave him. And my sister and I are like best friends. I don't want to lose her either! Should I just go about ingoring everything and pretend that nothing is happening?