I used to hate you whats with the change of mind?

ok so there is this girl i absolutely hated when i first met her in september, i thought she was an attention seeker and just fake pretending she cares about everyone and saying she doesn't hate anyone which i thought was bollox i hated her so much i was going too dish out the dirt to the press and at one time i almost hit her i felt so angry with her, but now everything has changed and i cant get enough of her, why had this happened? i just don't get it. please help