Question: how to stop thinking about someone who passed away?
Answer: Sometimes, you just have to cry it out. ... 
Talk to someone you love and find out that there is always someone out there that feels the way you do; you're not the only one that has had a loved one die. ... 
Keep your head up, think good thoughts. ... 
Sometimes you just have to let all the sadness out. ... 
Talk to a loved one.