Best Friend problem...?

Okay, let me start with he was my best friend ever we were inseperable he slept over my house for 4 months starit on the weekends and he was here ever day after school till 10pm... okay well he found a new friend and his new friend got him into smoking and drinking. I became a little to "motherish" as he labeled me. And one time i was drinking and he flippped out on me and would not talk to me for 3 days because i did it one time. and he will not let me tell him how i feel so we got into this huge fight and i have not talked to him for 3 weeks at the most now. I hate that he drinks and smokes he used to be anti anything illegal now he does this. and he flipped out on me when i told him to be carefull... and when he flipped out i couldnt keep my mouth shut so i was screaming back and last night my friend jake texted me and said you and austen need to fix this now because im stuck in the middle and i cant pick sides etc... and now i dont no what to do i really miss him and i hate that he just walked out of my life because of thoes things... i need to talk to him but not over text i mean in person... but when we fight or try to talk im not gonna lie he has hit me before and i have hit him... because of a fight we had and i dont no what he would be like now that he does this stuff....i dont want to get hurt... and we always wrestle and stuff but i dont want him to actually hit me and mean it... anyone no how i can bring this up to him?? he also texted jake and told him he misses me and he wants to go back and make everything better he didnt mean the text that he sent to me... but im not sure what to do... helpp