I don’t know what to do

Hey everyone. I hope you guys are all well. Today my boyfriend yelled at me. And it wasn’t just your standard yelling, we were in a parking lot and he was backing out and he yelled at me because I had asked him to take me to the store today. He had told me the night before that he had a call to take with his school and he asked me to wake him up so he could do it on time (he’s a heavy sleeper so one alarm won’t do). I did and all seemed well. He didn’t mention the fact, though, that he had another call with his school later. Anyway, as he was yelling at me, he continued to punch his steering wheel and yelled loud enough to have people nearby turn their heads. He was telling me that it’s one of the most stressful times of his life (which I totally understand and had he communicated that with me, I would’ve never asked). At that point, I felt unsafe but I didn’t want to anger him more and have him crash. He parked in front of a liquor store and he took some time to cool down. He’s yelled at me quite a few times before like this but I had pretty thick skin and I would just absorb it all. I’m not sure why today I’m considering this a red flag. Since the beginning of 2020, I would cry at the smallest things (and I’ve never been like this before). Of course, I cried in his car and he got quiet because me crying puts him in an awkward situation. Here comes the point where he tried to “fix” it by trying to buy the items on my list or getting me food or something. I’m mad at this point and I tell him to take me home since he is waiting for an important call, but he refuses to take me home. He tried to take me to the next store on my list but I just keep telling him to take me home. I start crying even more and he decides to turn around and park at another liquor store. He steps out and I just break loose. He obviously can see me through the store window but I didn’t care and I just let it out. He comes back and asks if I want him to step out so I can continue to cry and after, he can take me to the store. I told him it’s okay and we can just cut this short. He aimlessly drives around in circles after that and gets his call. After being on the phone, he’s more calmed down and it felt like nothing ever happened. He drove me home and the rest of the car ride was silent. I understand that the phone call was important, but he didn’t mention to me that he still had to call them later. If that was the case, I would’ve had him stay home to take it. Now, he’s been texting me just “Ok”s and just short, one worded texts. Normally we would call every night but I guess tonight’s not a normal one. I guess I came on here to share this because I don’t have anybody but him to talk to. I have no friends because I’m not the most social even if I try to be. He’s close with his high school friends but I never kept in touch with mine. I’m torn between the fact that if I leave him over this, I’ll be left alone (and I mean this in the most literal way as possible) and he’s probably the only person keeping me afloat (if that makes any sense). It feels good to write this and I’m glad I did.