I think the reason that an SPD can and will be infatuated with someone is because he/she believes (perhaps subconsciously) that "normal" people should pursue the opposite sex in the normal course of human events. But for me as an SPD my infatuation cannot progress to the next stage of love because my SPD is rejecting the associated constant contact with the love object and I feel anxiety. So I eventually sabotage or terminate the relationship. Thus the SPD person in the infatuation stage seeks to be like the larger population and temporarily is possessing two different personality constructs simultaneously (the normality seeker and the SPD), until the infatuation ceases.