I'm aware I'm probably going to get flamed for this...
My DSis has split with her husband after he discovered her affair. When he found out, she claimed that the man who she cheated on her husband with attacked and raped her when she tried to call the affair off.
I know it makes me an awful person, but I just don't believe her. As a rape victim myself, I cannot imagine how devastating it would be for my own sister not to believe me, but there's just too many things that don't add up, and every time I try to support her about it she changes her story.
She has a long history of lying about things like this, claiming (and then later denying she ever said) that various family members have abused her, she's been hired/fired from different jobs, miscarriages, mental illnesses, medications, hospital stays.... She can be very manipulative and often lies to get herself out of tricky situations.
As her sister I know I should be there for her no matter what, and especially if she's telling the truth. Even if she's lying, she obviously needs support with her marriage breaking up, and being so messed up that she's even lying about things like that in the first place. But having been raped myself, I am so repulsed and angry at those who "cry rape" that I don't think I'd ever be able to forgive her to support her.
I can't exactly interrogate her in case she's telling the truth - like I say, I can't imagine how devastating it would be for her if she is to find out that her own sister doesn't believe her.
Difficult situation, and I probably deserve to burn in hell just for doubting her in the first place...