Ever since he met you, Sunday's world brightened up, something that he couldn't feel since his childhood. Everytime he was close to you, his heart rambled uncontrollably. He was madly in love.
Eventually, he began stalking you, secretly taking photos of you and pinning them on a cork board in his room. He also began taking some of the things that belonged to you just to put them in a shrine in his room.
His obsession started getting worse and everytime he saw any boy/girl talking to you, he wanted to straight up murder them, but he kept his emotions in check.
Today, when he was stalking you, he saw that you were going to a club. He couldn't control himself anymore so he went after you, and when he saw that you left your drink unattended, he got an idea. When no one was looking, he spiked your drink and hid in a spot where he could safely watch.