Why do I feel this way towards a guy that would never like me even if his life depended on it?

So I've liked this guy since may (a little before my schools spring trip), he showed me the slightest bit of attention and i fell so hard for him. then we hung out with some of our other friends at this place and it was fun and all he got me a plushie, and thats when i started liking him more. he showed mixed signal like asking me on minecraft dates, called me pretty, and was super nice. but nmd bc he said it was all a joke, and i still like him...

Why do I feel this way towards a guy that would never like me even if his life depended on it?
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