My boyfriends father died.

Saturday morning, my boyfriend of 2 years father died in the house we all live in. I thought he was asleep in his room, his TV was on (I could hear it) and his door was closed, but he was gone... my boyfriend was asleep and I was getting ready to go to a family party, and his uncle came over and found him. I ran in as soon as I heard him yell “call an ambulance!” And I tried to perform CPR as I had previously been certified, but he was too far gone.. I had to wake up my boyfriend and tell him what happened.. the night before we were all laughing together and making jokes.. if I had just checked on him sooner he still would have been here. His family is telling me not to blame myself but I can’t help it. I don’t know how to recover from this.. the sight of his lifeless body and the sounds of my sweet, kind boy crying out for his father haunt me whenever I close my eyes. It hurts so much. Please help me.