You and cellbit are dating and he got bit, you refused to leave him, then you get somewhere that no zombies can get in, cellbit loses a little control and tries to bite you but you stop him

he notices what he did as you push him away, he sees you grab your pistol and aim it at him

"Y-you won't do it.. you cant't pull the trigger.. you can't pull it because you love me. it takes a very brave and a very cold person to do that."