I need help to cope, my soul mate died? ( sorta long)?

hello everyone, first I want to thank everyone for taking the time to read this, to make long story short my love of my life passed away and we buried him last week, he was only 19 and a Marine, he was shot in face and I have a wide range of emotions and I just do not know how to deal anymore.. We had three beautiful years together..here is some background information about us, I met him when I was 16 became his girlfriend at age 17 and lost him at age 19..We grew up together we matured together we finished high school together, we went through the procress of him becoming a Marine and us adjusting to Marine life, aswell as adjusting to my first year of college..he is my best friend and the love of my life my support system, the only guy I have done things with and now he is gone and I do not know what to do with myself I am devastated and so miserable and lost without him, it doesnt matter what I am doing or what people say the pain wont go away and with time it has only gotten worse..I dream about him every night and the worse is when I wake up and realize that it was only a dream and he is dead..he brought me an engagement ring and was going to propose when he had leave in July..we had our whole furture planned and its been taken away the point is I need advice from people who have actually experience a the lost of a loved one boyfriend/fiance/spouse how did you cope? Thank you (please no mean comments)