Ex Girlfriends keeps sending me snaps and viewing my stories?

So a girl broke up with me that I was dating for about 3 months. She apparently needed to be alone. I tried to make her stay once and then applied the NC. She texted me sometimes to say good luck and shit and even keeps sending me snaps and I was sending snaps too but on 20th April I realized I need to cut her off. Her birthday was on 29 and I didn't wished her. I know she wanted me to wish her cause she was sending a lot of snaps of birthday filters and shit but I said nothing. I dont watch her stories, neither do I send her snaps. But she still watches my stories and keeps sending me snaps. So what should I do? talk to her about boundaries or remain silent. Her sending me snaps kinda giving me hope that maybe the relationship is alive. Please help.

Ex Girlfriends keeps sending me snaps and viewing my stories?
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