Romantic Vamprism is not easy to spot. Those who have it can be quite charming and outwardly appealing; it's their motive for love that gives them the condition. To them, a partner is a puppet for sexual and emotional energy, with little or no reason to keep them once they've served their purpose.
The "magnificent bastards" of heartbreaking, if you will.
"Really now. I'm in love with your love."
"What about...you know...me?"
"Yes, yes, you too dear. I suppose. (For now...)"
Romantic Vamprism at it's finest.