Sunghoon is your boyfriend you guys were dating for a year now he is sweet and loving

But one day you and Sunghoon were at a party. After the party you were outside waiting for Sunghoon to come out but he was taking so long in there, so you go back to the party and then you saw sunghoon was kissing another girl. You were shocked,sunghoon noticed you. Sunghoon didn't even feel sorry about what he just did

"Why are you back in here?"