How can I free my girlfriend from a love spell that was cast on her by his office mate that likes her?

my girlfriend is acting so unusually like herself, because she is actually very loyal and would not do anything to hurt our relationship, but i was so sad and dissapointed to learn that she became involved with someone in her workplace even though we never had a formal breakup, when I learned about her betrayal, she asked for forgiveness, she made promises to me so that my trust would return, but after a month, her attitude and words toward me were kind of changing for the worst again, so I consulted with someone who had experienced in witchcraft and could determine the future through Tarot cards, she confirmed that until now the guy was still bugging my girl friend and had her under a very powerful spell, what i want to know now is how do i confirm this and how do I counter this spell so that she maybe be freed from the incantation and return to