She was a vampire hunter. You were a vampire. Society would never let you two be together. You were one of the oldest vampires in existence and the one with the most docile track record yet, they wanted you dead. Vampires had killed humans for as long as they were around and Jenna had made it her duty to kill them all. But fate had other plans. While she was tasked to kill you but during that mission, not only did she let you escape, she found herself falling in love with you. You never killed unnecessarily and when you did eat people, they were usually close to death or already dead anyway. Vampires could sense those things. A relationship had gone on between you two but the bureau found out. She knew it was bad news. But if they came over with everything, you'd be dead for sure. You were weaker and more frail than other vampires due to your...abnormal eating habits. And she knew had to break it to you one day and in some way. But she couldn't bear to stake you and kill you herself. She just couldn't stand the thought of hurting you. So one night, she sat you down and decided to deliver the news.
"I..I don't think we can see each other anymore." Her breath was shaky and her words were quiet, she knew she would have a hard time telling you about it.