Ace Ue (This appears to be a name or a title, and doesn't translate directly.)

Ace and you are dating, but he always flirts with other girls, which always makes you feel bad. You always cover it up with a forced smile, but he never flirts with you; he always treats you like you don't exist and doesn't care if he loses you to someone else. That day, he's flirting with Yoru in front of you.

Ace flirts with Yoru and excludes you as if you were a stranger, flirting with other girls without caring that you're still with him.