Overprotective brother and his insane reactions?

Okay this is the story... My older brother is in the mlitary and a few weeks ago he brought his friends home to visit for a while and I really hit it off with one of the guys. My bro seemed to have no problems with me and his friend having a relationship so we had an awesome weekend. Me and the friend proceeded to text and call each other and he decidied he was going to come visit me and we'd go to the movies that weekend. When we were out around halfway through the movie, the guy got text messages from my brother saying he was going to get beat up when he got home. We brushed it off as my brothers normal behavior but after the guy dropped me off at my house i noticed i gad some voicemails. I listened to them and all it was was my older brother cussing me out, calling me a , and threatening the guy. I, of course, started to cry and I called him to see why he was so mad because i hadnt done anything. he proceeded to say i'd spread my legs for anything (I still have yet to kiss a guy for crying out loud) and that his friend just wanted to screw me and leave me. i'm a pretty good judge of caracter and his friend never even touched me the entire time, not even holding hands. My brother say he was going to beat up his friend the moment he was him and continued to flip out on me and call me horrible things. I told the friend to be careful of my bro abd he said that 'he wasnt going to fight him'. He didnt fight him, he got the **** beat out of him twice. This lead to us not talking for about a week. When i finally asked him what was wrong he told me my bro had said bad stuff about me, said my parents hated him(they loved him) and that if he talked to me again my bro would beat him up. i confronted my bro and he just brushed me off and accused me of being stupid and naive and that we were 5 yrs apart(barely) and that he didnt want anything to do with either of us anymore. This lead to me and the friend breaking up and i talked to my brother again. he said that he had every right to do what he did and that i was just a crazy *****. I told him to stop acting like a girl and forgive his friend and he said that he 'cant look at either of us the same anymore' because i was some 'cheap slut' and his friend was 'a MF'. But as i said earlier, his friend and i never even held hands or anything! did i do something wrong, and if not how do i deal with my brother? He has always been my idol but im starting to doubt my judgement because of this situation.