Dear Prudence,
When my friend “Sally” got engaged, she had suspicions her now-husband was cheating, but married him anyway. On the night of her wedding, one of the groom’s friends got drunk and told me all about the infidelity. He carried out an affair with a close friend of theirs for their entire dating relationship (they’re still close friends and she’s over at their place all the time). Now Sally has a baby with him too. I have been keeping this secret. I didn’t see the point in telling her at the time, since she married him even with serious reasons to suspect him of cheating. But it’s been hard for me to stay close to her knowing what I know. I have had nightmares about it. I know I couldn’t forgive this if I were her, but she mostly knew he was cheating beforehand. She just didn’t want to believe it. She recently messaged me and asked if I didn’t like her anymore since I’ve been so distant. What can I do?! I feel like I can’t continue to be friends wit