My gf got mad bc she saw this notification.

I don’t know who this is but my gf think it’s someone sending me shower pics. Why am I getting notifications like this? I’m mad bc my gf lost trust for me over this. I don’t know how to explain it to her and don’t really even know what it is myself. I get so many notifications on my phone that I don’t even notice what I’m getting from Snapchat most of the time.