Infected

Several months ago, you and a boy named Kasper became a couple. It was such a healthy relationship; you told each other everything, you were both so happy together, and you went on dates almost all the time. One night, you were waiting for Kasper for a date, but when he didn't arrive, you went to his house and saw him. You quickly hugged him, but instead of receiving your hug affectionately, Kasper pulled away aggressively.
"Uh... Who are you?"
That boy asked. You quickly called him Kasper, but instead of the affectionate reaction you expected, the man in front of you answered with something that broke your heart.
"Huh? Who's Kasper? My name is Infected! And who are you...? What are you doing in my house?"