I don't reckon you have split personality, nor is it depression.
It's you being unwilling to accept the fact that your bf has a new
gf while you have stop moving on with life.
Why is it that when you're alone at home, things which had never
happened while you're outside is now coming to you. Reason is becoz
you dread loneliness. You yearn for companionship. You cannot
accept that he's out there living a happy life, you allow yourself
to be swallowed in self pity, even to the extent of allowing your
mind and soul to be weakened. Subconsciously, you want alot of
attention that's why you seek him out, tell him about what is
happening to you. Hoping he'll empathise with you, tells you things
you want to hear very much... you are actually hoping he'll feel
remorseful for breaking off with you and subsequently come back to
you. You want to feel the closeness with him, you hope for time to
go back to where it stopped. But it's not going to be happening, my
dear... you have to be brave and stop torturing yourself, him and
his gf. It's not fair to anyone, especially yourself.
Bear in mind, throughout your post, you mentioned you wanted his
attention. Please remember one fact, both of you are leading
separate lives now. You should treasure yourself and live a life
fuller than what you're going through now. In order for him to feel
remorseful over leaving you, you have to make the best out of what
you have, not to pester him and leave nothing but bad impression to
him.
You do not need any psychartrist, you need yourself to get well and
be well. For yourself, for the ones who love you. Please move on
with life and prove your worth to the one you love by ensuring you
do not ruin yourself in any manner.
Please PM me if you need help. I'll be around... hoping to hear
from you.