My friend is mad at me and im clueless, help?

okay first period, this boy i knew him since second grade. yeah, hes a little sweetie, hell always be partners with me, always tell me to sit with him, were just FRIENDS, and one time i was late to cl he like waited with me. hes the nicest guy ever. I can tell him ANYTHING, and he helped me sooo much. without him, i wouldnt of ped my biology test :) so hes dating my friend and i am so happy! and then today, he was mad at me. well i was talking to him, and he was ignoring me. i was like "que", whuddever. he told me to shut up, and cussed at me like mad!! and i cussed back, and at first i thought he was joking but he wasnt one bit, he didnt smile or anything. i dont know what i did. my friend in there tried to stop it, she was like whats with you, your being soo mean to her!, to him. and he says he was just feeling mean today, and im like what the hekk why is he only mean to me!! and then he kept cussing at me evreytime i try to talk to my friend, hell be "shut up, your stupid, noone even cares what your saying" (with cuss words in between) and i tried to cuss back but i stutter and i think its becuas hes too close to me, and i cant to him. usually like if a stranger said that i would go off, but to him i stutter nervously. i felt like crying!! i was soo about too, i kept sucking up. then he socked me like POW. i pretend i didnt felt it, i was so glad to get out of that cl. i ask my friend who was dating him, she said that they broke up, and dont worry about it. they datted for the whole skewl year and now at the end of skewl, they broke up. maby he was just angry?, i just dont know, i keep thinking about it, hes like my big bro for life, at least thats what i thought? should i still talk to him, after he embared me an hurted me in both emotions and body?