HELP ADVICE PLZ

Me and my bf have been dating for 8 months. We met at work. He does have some problems like drinking and ex drug addiction but I didn’t know until later on. He’s so obsessive he gets upset if I don’t text him back quick or if I forget to and he sees me on snap. Anyway, my job environment has turned toxic so I decided to put in my 2 week notice today. At first he’s totally sweet and says I want you to be happy I love you and all of that. Then he starts posting on snap him drinking liquor while driving. Then I confronted him about it and he said that I don’t love him, I don’t care , that I ignore him 24/7?!!! Then I send a response back saying how toxic he’s being and how I do care. He doesn’t text back. Next I see him on snap posting pictures of a full bottle of liquor, beer, and a gun with the clip undone zooming into a BULLET??! I’ve been trying to get away from him for a while because this type of behavior is toxic and abusive but Idk what to do. What if he hurts himself? And I don’t even know what triggered it??