I don't know

I'm not sure what to think of the relationship I'm in with Brad. I know one thing: it isn't necessarily a good thing. He doesn't support me and just gets mad at me if something doesn't go according to his schedule (yes, he is the one that thinks he is "spontaneous" and "flexible"). For example, I went to lunch with my friend, R, yesterday. It was great to see her and to catch up on everything. It was so much fun! We laughed and laughed about "Neuticles" (the ball implants for pets), and time passed without us realizing it. I looked down at my watch and saw that it was 5:00! I took R home and hurried home. I knew me being out so late wouldn't sit well with Brad. He's very particular. When I got home, he went off on me because I made us miss the spin class. I didn't apologize; I didn't do anything wrong. I just don't feel like I made us miss the spin class; he could have gone without me! So, I asked him if he was ready to go workout, and he went off about how I was selfish and critical of him. I really have no clue where that came from. He muttered some things about me under his breath, but I didn't say anything. He got ready to workout and just left while I was changing into my workout clothes. I drove over in a separate car because I wanted to work out. After doing a bit of cardio, I asked him for the workout schedule. He offered to show me which exercises I needed to do, which was nice. One of the exercises I wasn't sure how to do it even after he explained it to me. He goes, "Are you stupid or something? What the fu*k don't you understand?" I just turned and walked away; I don't need to listen to him talk to me like that!! While I was doing one of the exercises, he came over and asked me if I had anything to drink with R. I had 2 beers over the course of 4 hours. He asked me who else was there. There wasn't anyone else there. He kept prodding asking questions obviously believing that it wasn't just R and me. I sick of this! I really don't know if I can take much more of his attitude towards me. It sucks! I have no idea what I did to deserve this treatment. For a while, I thought it was something I did, or that I somehow offended him. But, you know, I think he has some control or emotional issues. . . something. I'm not going to allow him to take me down. . . or make me feel bad about myself. I've had abusive boyfriends in the past (one broke my hand), and I don't want to be in one again. Maybe I'm wrong? Maybe I'm the one that has a problem? I can't imagine what it is but maybe I did something to trigger this anger in him? I really don't know. I do know that it is hurting me, and I don't feel like he really wants me to be happy. He never asked how R is doing, or stating that he was glad I had fun with a friend. He could have handled the situation so much differently than the way he choose to. I'm just hurting inside, and I can't turn to him because he is the one that is hurting me.