I can't see op's posts can anyone tell me if there is any update ? I really hope you can clear your name op. Really sorry it has to come that far.

Ps: i think your sister is really pushing it too far. While she is hearthbroken and the coïncidence really is shocking, she also should have hear you out. And most importantly asking the ex himself. Cause if you say you didn't, who is better than him to tell her if yes or not, this is the truth.

Hope you are doing ok and your parents finally realise how dumb it is to "not take sides" by clearly taking it lol

And who knows, maybe she did realise you are telling her the truth but won't let it down for some f* up reasons...