Cheated on over drugs 😓 Screenshots included

Okay so this is going to be really messy but yesterday I found out that my boyfriend (who ive been with on and off since middle school) cheated on me at my friend's party about two weeks ago. This guy essentially lived at my house, my family and myself did absolutely everything for him. Honestly I shouldn't have been so stupid, he'd cheated before but I stupidly forgave him.

So my friend's 19th was on July 3rd. We threw her a party to celebrate and there was a decent amount of people there. at about midnight my boyfriend comes up to me and says this girl wants cocaine and he knows a guy. We're gonna call my boyfriend R, the girl A and the dealer W. R then tells me that in order to get it he has to go with A (W picked them both up to go get it or some sketchy shit) R knew I was anxious about this because he did have a thing with this girl WHILE we were dating m

but this time we agreed was a fresh start and we both need to trust each other with our all. I honestly wasnt up for a huge fight because thats what it wouldve turned into if I didnt let him go so I just looked for the best in the both of them and trusted his word. About an hour and a half passes and they still arent here and I'm low key freaking out (for the wrong reasons, i thought he got hurt or something haha my dumbass) anyway they eventually show up and R comes over and acts all sooky to me and kisses me and says he missed me (looking back i wanna puke) so that was the end of that. This crazy A bitch got her cocaine. So time passes by. R is with me everyday. Sleeps in my bed with me every single night. Hell he even came with me to our FAMILY REUNION and not a fucking inch of guilt crossed his face. That's honestly evil in my eyes. So on Tuesday we went to a party and dance for our town and I had a great time!! But I didnt see R the entire night, I just figured he was with his buddies but apparently he went to get himself some cocaine (something I'm dead against and he knew before we ever got together that I wouldnt want to be with him if he did that stuff) (pretty sure he did it that night at the party too) I've noticed his behaviour drastically changed the last few times we went out. He'd be violent and loud and angry. he'd also grind his teeth like crazy. Anyway we went home and I ask him nicely "you didn't do any drugs like that did you?" and he FLIPPED for me even asking (even though it was obvious he did) it was my fault and im crazy for thinking such a thing. When the fight calmed down. I check my phone and it's W trying to get ahold of me telling me that he cheated that night and whatnot (ss is below) so at this point it was 4AM. R was intoxicated and I was scared to say anything until morning because he would've gotten aggressive or drove away and died or some shit. So I waited. I was stuck in bed with the guy who's supposed to make me feel loved and safe, but instead made me feel sick and used. Morning finally comes and I decided I needed more proof so I could really shut him down. I message A and remarkably she responds with the TRUTH. I got out of that bed so fast. I was shaking and crying so much but I forced him to get up and told him I knew everything and to get his shit and get the FUCK out of my house. It was so hard but there's only so much emotional trauma I can go through with this guy. I guess I'm just looking for some support, maybe share your stories, how you got over them, etc. Any questions feel free to ask. This app is like one big family and I appreciate you guys so much.