My boyfriend tried to commit suicide. ( sorry it's so long)

Last night was my school dance, and my boyfriend basically did everything for it. The food, the dj, everything. Okay so yesterday I stayed home from school because I had the flu and my mom told me she didn’t want me going to this dance and getting more sick and getting everybody else sick. So I told my boyfriend. He then flipped out and ran into my house screaming at me telling me to get out of bed and that I’m not sick and I’m faking it and that I’m going. (I had a 100.2 fever) anwyay it’s not the first time he’s done something like this…like yelling at me getting really angry and pulling me somewhere. I told him to leave my house and that I never wanted to see him again(because he physically hurt me) and he pulled me out of bed and forced me to talk to him and I finally said I’ll go to the dance but I can barely stand up so I’m sitting down the whole time. My boyfriend then said okay and left to his friends house across the street from me. I don’t remember how it started but he kept texting me”I’m gonna kill myself tonight” I wasn’t believing any of it so I told him to shut up and come over and talk to me. He then started to explain to me how he was gonna do it and that he has a knife and he’s going to tonight after the dance so “make this a good last night for me. Make yourself look pretty. Do your hair and makeup” I was bawling. My mom asked what was wrong..I told her everything. I was crying hysterically on my bed and she called my dad. My boyfriend came to pick me up and my mom went outside to talk to his parents.my boyfriend came in and saw me crying and said get up we’re going get the up don’t make me cry make this a good last night for me. Then he took me into the car. We went to his friends hosue to take pictures and everyone was like wtf you look like . And my boyfriend just said that I’m sick. We left to the dance and everything got really blurry and it felt like a dream. I felt alone. I told my boyfriend I had to leave and he just kept holding me tight saying I’m not leaving and to make it a good last night for him and that he had a knife in his pocket and he was gonna pull it out right now if I left. I was bawling at a table and my friends had no idea what was happening. I then told one of my friends jamie and she was in shock and took me into the bathroom to clean up. She told mei had to tell someone. So me and her told the principle. And I called my dad. I went to go see my boyfriend and I told him I was sorry and that I loved him so much. The principle took him away and my teacher told me I did the right thing by telling someone. I kept thinking to myself “if I did the right thing, why do I feel so shitty about it?” my dad picked me up and my principle talked to him. I went home and tried to get my mind off of the pain by watching a movie;it only made if worse because of all the love in it and I missed my boyfriend” I was scared for 2 reasons. 1-hes not okay and went and did something really bad. And 2-he doesnt love me anymore. He then texted me and I had the biggest smile on my face. It said don’t tell anyone. Then he told me that we can’t be together anymore, that its not healthy. And that his parents wont let him out for a while and he doesn’t know if he can see me for awhile.

Someone please help me:/ I’m so depressed I honestly don’t know what to do with myself.