My ex fucked a dude 5 weeks after our break up, is it wrong to feel mad?

She said she broke up because she didn't feel the love anymore, then she went to school with a hickey on her neck and told me she fucked another dude. Yeah we broke up but it feels so fresh, did I overreact? PS I didn't call her a hoe or anything, I just personally felt bad.
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We also dated for a year and a half.
My ex fucked a dude 5 weeks after our break up, is it wrong to feel mad?
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