I need help

My boyfriend thinks I'm a liar me and our friends went out of town and went to some bars he said he would take care of me and I was soo excited because that never happens and so I went for it gonna have the time of my life I went blank came too to my boyfriend putting my Pjs on me and we were soo happy and I fell asleep I woke up to him finishing a half a bottle at 8 in the morning knowing he was going to be belligerent he got so drunk to him yelling at me in front of everyone saying I was a evil lying slut and I should tell the truth but I had no idea what he was talking about and this was a month ago mind you and we got home and he yelled at me all the 3 hour drive home and we got home and I started crying and he started saying what did i do it's all your fault and apparently when we were at the bar a number called for me that started with a c and i ran outside to answer it and my boyfriend immediately thought I was cheating on him but my friend said it was the cab and I needed to talk because I ordered it and me not knowing any of this I said I was sorry and if I was doing anything untrusting that I'm sorry and I'm done drinking and I dont want him to feel this way and he said he loved me and we went to bed and I woke up to him screaming at me at 3 in the morning being called the exact same thing as last time I didn't got to school the next day I was to tired and he went to work not to come home he said he needed a break from us so I gave him his space he was supposed to come home after thanksgiving snuck out of his mom's to go on a 4 day bender not talking to me and when he would he would call me a liar and it's all my fault he's an alcoholic and he finally sobered up saying he wanted to come home and he loved me and said that he doesn't have respect for me and he doesn't trust me but says he loves me and wants to know why I'm lying about that night and why my friend would lie for me and now he hung up on me boyfriend of 3 years 😪💔 what do I do I dont remember that night and I dont know what to do or say for him to believe me