Boyfriend still lives with his ex?

My boyfriend and his ex bought a two bedroom condo two years ago, the two broke up and are now living in separate bed rooms. They have decided to sell it but with interests rates so high they want to wait until rates drop or they may lose money and they live in a very expensive city. It driving me crazy. Should I give him an ultimatum?
Yes, doesn’t matter he needs to move out ASAP
No, it makes sense why he has to stay
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Boyfriend still lives with his ex?
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