I'm getting ignored?

Basically I've liked this girl for 4 years!
I've only started talking to her and she started speaking to me too and it was all good
Then all of a sudden I was getting ignored my messages were being read and I was not getting any reply
She replies rarely and I need to know what to do next
I tried to change conversations to something more interesting
But I'm still getting ignored even when I say "hi" I get no replies
Someone please help this may be the last couple of chances I have.
I'm getting ignored?
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