Should I be pissed at a girl who hasn't opened my snapchat?

There's this girl in my class that I see everyday. We talk every now and then. I sent her a snapchat a week ago and she still hasn't opened it. She has done this thing before. I never bring it up when we talk... would you be stingy and mad at someone who did this to you? I mean I've gotten so stingy to the point where I kind of ignore her
Should I be pissed at a girl who hasn't opened my snapchat?
Post Opinion