Why would my ex girlfriend use a fake profile to look at my social media?

Ex broke up with me 2 months ago. Blocked me and unblocked me cycle for about a month and watching my Instagram stories with a fake profile (I’m 100% sure it’s hers).

She did this for a month, then stopped for three weeks, now she’s back doing it.

Why would my ex girlfriend use a fake profile to look at my social media?
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