what should i do?

im 18F and my bf is 18M. so it started last night, me and my bf were on call like always because we sleep on call. and he felt off like he sounded off so i was wondering what was wrong i was like “are you tired?” he said he wasn’t and i was like what’s wrong then you seem kinda off and he said it was okay and he didn’t wanna talk about it and i was like are you sure your feelings are very important to me and he said he was sure so i left it alone but in the morning when i woke up for school i sent him a long paragraph about how i love him and how much his feelings mean to me and i was there for him. and then we had third period together in school. and its an ap class and our teacher gave us a practice ap test for the real ap test so we can see what its like. and we sat next to each other during it, not directly next to each other he sat two seats to the left because our teacher didn’t want anyone sitting directly next to each other. and i was done with mine already and i was talking to my friend who was behind me and i asked him what question he was on (my boyfriend is friends with him too) and we were just kinda whispering to each other and my boyfriend out of nowhere got upset and told me to “shut the hell up” and he sounded mad so i legit just shut up and put my head down and when he finished his test he tapped me and said he was sorry for getting mad and i was like whatever it’s fine and he was super apologetic. but i really don’t think it’s right to tell your partner to shut the hell up because you’re stressed but whatever. i asked him what was wrong because clearly something happened for him to say that he was clearly stressed and he said he’d tell me later. fast forward to lunchtime we have the same lunch so we go to a stairwell and sit near the stairs to talk and he was telling me how he feels like i don’t love him the same which bro i don’t get because i try so hard especially this morning with the paragraph. im constantly with him, i call and text him, all of that. and he didn’t even tell me what i was doing wrong he just said that’s how he feels. and i said i was sorry because i just didn’t know what else to say and he was all like no it’s not your fault and whatever. fast toward to when i get home he knows i’m upset with him because i made it clear and i told him i didn’t know when id get over this and i said i was hurt. he told me how he was overthinking and that he didn’t mean it in a mad way but he legit apologized for being mad so idk what he’s talking about. but anyways he send me a 14 second long voice message of him crying and it was horrible and my friend said that’s manipulative. legit the reason he yelled at me was because he was stressed because of the test and because of the other stuff he said but i wish he told me he felt that way before he blew up at me. idk, what do you think? my friends say it’s a red flag and we should break up but idk what to do. this is still a developing story but yeah rn we aren't talking