I don't understand this
 

Everyone keeps saying i have Split Personality Disordr and it is really scaring me cause i dont get why They tell me Aloen dot excist and my bf ges mad if talk to her but she does i cant really be that mad. How could i imagine a vital person in my life?? People say its good that it confuses me cause it shows i aint that bad but i aint eve bad., this is really starting to scare me

Hun, please can you get it checked out? It sounds serious
x

I think they mean Dissociative Identity Disorder. This other self, Aloen, is probably parts of your feelings, memories, thoughts that you have split off from the rest of you for a reason. Usually something traumatic. So, in many ways, it does exist.
As Ami says above, it's important to get support to help manage this alternate self, and the ways it effects you, and maybe understand why it got there in the first place.