Ive been in a relationship with this girl for 4 and a half years, for the first 2 she lived here but then moved to the US for college. At some point this guy came into her life but she kept telling me not to worry that he was only a friend. But only a week ago she declared she was going to marry him and she shows no remorse for it, saying things like I don't care. All those years we talked so much about our future together and then out of no where she betrays me. She has Multi Personality Disorder which did cause a lot of pointless fights but I still loved her and saw her as the only one for me. Now I don't know what to do. How could someone do such a thing?