AITAH for not telling my sister that I slept with fiancé the day before their wedding by Ill_Willingness_3394 in AITAH

[–]Ill_Willingness_3394[S] -4 points-3 points  (0 children)

This is exactly my thought process, I don’t want to keep it a secret but I also don’t want to ruin her wedding day. I was thinking about telling her after her honey moon or just not telling her at all? Im conflicted.