My crush asked for a streak but won't open my snapchats?

A few days ago, I added my crush on snapchat. A minute after he added me back he sent a selfie with a 'streak' sticker on the picture.
my friend also added him a few days before but he didn't send her anything.
i was so happy. I thought I was special, that me might even like me back?
so I replied with a selfie and a streak sticker.
the next day we sent streaks, but the day after that he stopped opening my snapchats. I sent one every day, but he never opened them. He sends me video streaks twice a day, but hasn't opened any of my pictures or videos. What does this mean?
also, i smiled at him in school and he smiled back. I look at him in the hallways and he always looks back. Does this mean anything at all?
my crush is also Spanish, he's in my school for a month for an exhange program. Is there a chance he might not really understand snapchat or something?
My crush asked for a streak but won't open my snapchats?
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