Is my ex trying to make me jealous?

We are on no contact for three weeks. I accidentally seen her instagram story, just 2 girls including my ex with 6 guys in a garden having a campfire. In my head I can't sleep because I'm think she is gang banging them all. We can came from a loving 3 year relationship but she broke up with me and said she is using tinder. Also I'm her first guy to take her virginity. Is she genuinely going through slut phase now? I feel sick and want to block but at the same time I could be overthinking and want to make things work again. She didn't even look at my instagram story, does she just dont care anymore or is it all mind games?
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Is my ex trying to make me jealous?
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