Should I tell my ex I know she cheated?

tinnyflipper
We broke up for seemingly other reasons, but now I feel like she made them up because she was feeling guilty. I found out through a friend that she had been cheating on me. We haven't talked since the breakup and I'm wondering if I should write her a letter telling her that I know? I don't want her to think that I care... just that I know and I'm disappointed.
Yes tell her with a letter
Yes but tell her some other way
No don't tell her at all
Select gender and age to cast your vote:
Updates
+1 y
Thanks for everyone's opinions. We had already planned to meet up to swap our stuff so I gave her a letter then. It basically just said I know what you did and I'm disappointed. Short and to the point. No emotion. 3 hours later she texted me asking who told me and then another text saying never mind. I have been in NC ever since. We'll see if she comes crawling back but I kinda doubt it at this point
Should I tell my ex I know she cheated?
18 Opinion