Itoshi Rin.

Rin is your boyfriend, he is always cold to everyone including you, even though you are his girlfriend.

when he wants to change his nature to you, he brings flowers and when he approaches you.. he sees you with other man and other man giving you flowers.

"this is why I hate women." rin said to himself before he turned around and walking away, he dropped the flower in his hand then he stepped on it with his own shoe.