How would you react if your ex moved in with your sibling?

How would you react if your ex moved in with your sibling?
I just got curious about it, as many of you know when I moved out my ex girlfriend and my sister remained in the apartment and still live together.
Sometimes when I hand them money they still try to convince me to move in back with them, but I kindly decline. I think it's a bit weird but okay.
How would you react in that situation?
How would you react if your ex moved in with your sibling?
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