*** SPOILER ***
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Because he was in love with Haewoon, but he didn't know it was love, since everything to him was 'boring' and colorless until Haewon called his name and "picked his interest".
Ever since, he has been chasing, befriending and waiting for over 10 years for MC to love him and therefore own him or be together with him. But felt betrayed that Haewoon gave his virginity and continued his physical relationship with his friend instead, as he thinks he does not love him back even though he was the only one for him always and vice-versa.
Also, if you think this is crazy... you're in for quite a ride lol
Has there been any seme point of view chapters yet? I need to know why he being crazy