There's only one thing for you TO do. Your sister will be devastated, but you can't keep this kind of thing secret from her. This is her husband! One thing that might happen, he might end up telling her himself, knowing that you know now. I think it's best that if he hasn't already told her, you need to tell her in person. This is something she needs to know. Yes, your sorority sister is important, but your sister is blood. Blood is thicker than water. I would be sure to tell your sorority sister as well. He shouldn't have your sorority sister to fall back on, and if she doesn't know he's married, she needs to know--another secret that can't be kept. Two women you love are going to be hurt, but it's better for them to be hurt now than down the road.
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