Stage 1: You recognize that you have a searing hatred for the person, yet you feel the need to talk to them, and can associate your feelings for them closely to the effects an addict exhibits.
Stage 2: They begin conversations with you, followed by many insults, using your reactions as entertainment before impolitely asking that you leave.
Stage 3: At this stage, the illness has progressed to an irrevocable level. You can't deny that you have affectionate feelings for said person, amidst your mingling hatred for them.
Stage 4: You're royally fucked.
Treatments and Cures: There are no known instant cures for Pseudophilassity. After some time, the body's defenses will overcome the illness, although moving to a different continent may in some cases help the healing process.
Mary: Oh no, Anna, I think you have Pseudophilassity!!
Anna: Fuck my life.
Mary: Welcome to my world.