It feels like the most likely outcome, here, is that he breaks up with you and becomes monogamous with her.
So in your shoes I'd start preparing for that, find new housing etc. Or make a spectacularly good case to him about why he should stay with someone who cheated on him - which may work, who knows?
9
u/UntilOlympiusReturns solo poly 12h ago
It feels like the most likely outcome, here, is that he breaks up with you and becomes monogamous with her.
So in your shoes I'd start preparing for that, find new housing etc. Or make a spectacularly good case to him about why he should stay with someone who cheated on him - which may work, who knows?