He didn't ciuman her because he didn't think he deserved her atau was good enough for her. He was a vampire, and at that time he was still at risk of falling to Level E. If he kissed her, told her how he felt and they became a couple, she'd just be lebih hurt when she lost him. Knowing that he loved her could also make her lebih willing to risk herself oleh continually giving him her blood, atau she could just be lebih at risk oleh spending lebih time with him.