Ingénue fatale (2008)

Meet Elizabeth, an art history professor who can't seem to make a relationship work. When she finally meets the guy of her dreams, the mysterious new professor at their university, she struggles to have a successful relationship while keeping her secret.... that she's a vampire. Guided by advice from her best friend, Tate, she must ultimately decide whether it's worth the risk of outing her hidden blood-lust to her new beau in order to make their relationship work.