My Psycho boyfriend

I don't want to say too much or it will give it away...

Billie Joe started to see these figures about a month after his father died. His girlfriend (y/n) started to worry and noticed that it wasn't right, she made Billie seek therapy but these beings only seem to be getting worse. His therapist subscribes him to some medication to help, but these beings seem to be getting stronger no matter what he was to do

Does he kill someone? Does he go insane?
Read to find out...