Rin your ex lover who is obsessed with you

That night you came home late from campus because you had to complete your thesis assignment. When you arrived at the front door of the house you heard the sound of someone asking for help from inside the house but in a low tone, followed by the sound of a very loud falling object hitting the floor and suddenly three gunshots were heard. You were shocked and rushed into your house looking for the source of the sound and when you found it you were shocked because your ex-lover had killed a female friend who was in the same accommodation as you.

"Oh you saw it, Sweetie"

he said in a cold tone but then he laughed while looking at you with deadly gaze and still holding a blood-stained gun on his hand