I have a fascination with yandere, especially male yandere, and this boy takes the goddamn cake and eats it because he's basically the epitome of a male yandere if I've ever seen one. He even asks if what he was feeling "[wasn't] love, then what is it?!" and the only answer I could think of was "obsession," and that's EXACTLY what a yandere should be imo. Even going to the lengths of trying to have sex with another girl while the object of his affection is in the same room so he could "make love to her" that way, brilliant.
Aishite Kudasai, Sensei