Lemonade

I had a childhood friend who was like family to me. He and I were truly 'friends,' but when I heard the news of his first love, I was devastated. I actually liked him...! I have to end this unrequited love no matter what! But... why is it so hard to stop liking him? Is this what unrequited love is like?! The first ordeal of youth, sour yet sweet like lemonade, first love. (Source: Naver, translated)