My ex has started adding my sister (who he’s never met) on social media, months after me/him last spoke. Is this weird? (sis-17 ex-20 me-19)?

He’s fully aware that the break up messed with my head, and that she would tell me he added her. I know it’s none of my business who he adds, but it’s my sister.
My ex has started adding my sister (who he’s never met) on social media, months after me/him last spoke. Is this weird? (sis-17 ex-20 me-19)?
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