Developing a strong case of oneitis, where you become obsessively fixated on one person to the exclusion of all other options, can have detrimental effects on your dating life and overall well-being. It may cause you to lose touch with reality and ignore red flags, potentially leading to an unhealthy or unbalanced relationship. Additionally, this obsessive degree of attention can be perceived by others as desperate or low value, making it challenging to attract and maintain healthy relationships.