Help :(

My boyfriend & I are about to make a year of being together. We have so many plans for our future but we almost broke up yesterday. I'm about to go to day & night school & I'm gonna be needing something to move around. Since he bought a new truck recently he wants to let me borrow his old one to go to school & do whatever I need to do. But he told me that my little brother couldn't be playing in his truck or getting on it, or if my mom wanted to send me somewhere that I couldn't use his truck for that. That he was letting me borrow it for me & for whatever I need not somebody else's needs. And that he doesn't want anybody disrespecting the things he worked hard for (because one time my little brother was playing in the bed of his truck but I didn't know it bothered him so I didn't tell him anything). So we kept talking & it let to an argument, & I found out he doesn't like my mom or my little brother, & that he rather not be around my family. And all this time that he's been around them I always thought that he didn't have a problem with my family. Now I'm confused & I don't know what to do. I love him but it's like he just revealed a new side of him, and I don't like it. Any advice ??