How can I tell if he is fallin in love with me?

I been seeing the guy for about 4 months now (i know thats not a long time) but he knows i dont claim him as my man, but he tells everyone i'm his girl. i've met his closest friends and he alwayz wants to take me around his family. He gets upset when i dont let him take me out, and he stopped talking to all the other girls he talked to before me. He tells me when other girls try to get with him. His brother (the person he's closest to) alwayz calls me his wife. The guy i'm talking to is not the sensitive type of guy he's more of the thuggish type and that is what confuses me more. plus i've asked him but he dont talk about his feelings.