What does it mean when a boy didn't reply a proposal even he saw the mssg?

yoonchaehyun
I proposed a boy who is a senior (we know eachother) in my school by typing "i like you" on facebook messenger though we are not friends on facebook so it went to his pending messages after that he accepted the pending message which means he saw the proposal but didn't reply to the proposal. what does it mean?
What does it mean when a boy didn't reply a proposal even he saw the mssg?
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