Guys, Can you please help me?

There was his boy who had been a really good friend of mine from the past 4 years. He gave me all the signs that showed he was interested in my, like staring a lot when I wasn't looking at him, blushing and smiling at the ground while making eye contact with him, his pupils were dilated, he used to get jealous when I used to talk about other boys or my crushes in front of him, and used to be very happy when I used to get over them. Even I had HUGE crush on him for all these 4 years. But after a year, we weren't in the same classes, and he started crushing on another girl and totally forgot about me. I cried a lot for him. One day I decided to tell him that I like him, and all he did was send me laughing emojis. I was heartbroken. That girl has a boyfriend, but it's like he's always wandering around her, and seeing this breaks me. Why did he do this?
Guys, Can you please help me?
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