I see my dead girlfriend everywhere I go. what should I do help me please?

My girlfriend ( 16 ) died a year ago. She jumped from the 16th floor of a building after I broke up with her.
She called me many times after we broke up but I didn't pick her phone and the next thing I know she is dead.

I have been in shock for an year now but I thought it's time to move on so I started dating a classmate at school recently. Ever since I decided to move on , I have been seeing my girlfriend in my dreams every night

first it were just the dreams , now I am seeing her while I am fully awake. She follows me everywhere , she sleeps in my bed. She doesn't say anything.

I know I sound crazy , but right now while I am typing this , she is across the room sitting on the sofa watching me. What should I do? I am being very serious please help me I know I definitely sound very crazy and delusional saying this
I see my dead girlfriend everywhere I go. what should I do help me please?
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