You were dating Giyuu, however, Giyuu was spending more time with Shinobu.

Shinobu flirted with him and he flirted back. You decided to approach Giyuu about this matter and he got defensive and you two ended up fighting.

“You know what? I hate you, I want to break up.”

Giyuu exploded, but instantly regretted his words and covered his mouth.