My boyfriend almost killed himself because i broke up with him!?

i don't know what to do. just a few days ago, i got into an argument with my boy friend because he is very jealous, and i told him i was tired of him actingi that way. i told him that i wanted to break up with him. i told him forget about me, delete me from your phone, erase me from your mind and heart, and leave alone. he said "NO" than i said, fine, just remember that anything i say to you is the things that you want to hear,not what i want to say. if i say i love you is because thats what you want to hear. then i told him i wanted to go home, because we were in his house. so he said, "ok i will take you home, and you really want to break up with me? thats fine too lets go". when we got to the car, he opened the back seat of his car pulled out an ak-47 and loaded it, putted under his chin, and said "alright you dont love me, thats fine" when i saw that i started crying, and i said, please dont do that. lets talk it out. he walked out a few feet away from me, with his back facing me. then, he pulled the trigger, and fell to the ground. when i saw that, i started screaming, and calling for him. but then he got up. apperantly he put the rifle on the side of his head, and not under his chin like he had before. then he came to me,, loaded the rifle againg and put it under his chin again. i went to the back of the car, and asked him to calm down. he said "you dont love me" i didnt know what to say. i got on my knees and begged him, to stop. he wasnt listening. then i said, please calm down lets get out of here because the police is going to come, and i dont want you to go to jail. at that point, i managed to make him stop, and we left his house. what happened next, is that i talked to him, and said that i was sorry for what i had said, and that i love him. I DO LOVE HIM, but i know feel, that because of what he attempted to do i cant leave him. i am afraid that he might actually kill himself. what should i do??